As of March 31, 2017, our Portfolio included approximately $1.9 billion of financing receivables, investments, real estate and equity method investments on our balance sheet. The financing receivables and investments are typically collateralized by contractually committed debt obligations of government entities or private high credit quality obligors and are often supported by additional forms of credit enhancement, including security interests and supplier guaranties. The real estate is typically land and related lease intangibles for long-term leases to wind and solar projects with high credit quality obligors. The equity method investments represent our non-controlling equity investments in renewable energy projects and land.

The following is an analysis of our Portfolio by type of obligor and credit quality as of March 31, 2017:

Financing Receivables and Investments

In accordance with the terms of certain purchase agreements relating to financing receivables or transactions, payments of the purchase price are scheduled to be made over time, generally within twelve months of entering into the transaction, and as a result, we have recorded deferred funding obligations of $175 million and $171 million as of March 31, 2017 and December 31, 2016, respectively. Approximately $43 million and $41 million of those investments were pledged as collateral against these obligations as of March 31, 2017 and December 31, 2016, respectively.

We had no financing receivables, investments or leases that were impaired or on nonaccrual status as of March 31, 2017 or December 31, 2016. There was no provision for credit losses or troubled debt restructurings as of March 31, 2017 or December 31, 2016.

The components of financing receivables as of March 31, 2017 and December 31, 2016, were as follows:

The following table provides a summary of our anticipated maturity dates of our financing receivables and investments and the weighted average yield for each range of maturities as of March 31, 2017:

Real Estate

Our real estate is leased to renewable energy projects, typically under long-term triple net leases with expiration dates that range between the years 2033 and 2056 under the initial terms and 2047 and 2080 if all renewals are exercised. The components of our real estate portfolio as of March 31, 2017 and December 31, 2016, were as follows:

In 2017, we purchased a portfolio of over 4,000 acres of land and related long-term triple net leases to over 20 individual solar projects with investment grade off-takers at a cost of approximately $138 million. Approximately $21 million (1,100 acres) of this real estate portfolio was acquired through an equity interest in a joint venture that we account for under the equity method of accounting and approximately $49 million of our purchase price was allocated to intangible lease assets on a relative fair value basis. Up to an additional $8 million may become payable under this transaction upon completion of certain project related contingencies.

As of March 31, 2017, the future amortization expense of these intangible assets and the future minimum rental income payments under our land lease agreements are as follows:

There are conservation easement agreements covering several of our properties that limit the use of the property upon its lease expiration.

Equity Investments

We have made non-controlling equity investments in a number of renewable energy projects operated by renewable energy companies as well as in a joint venture that owns land with a long-term triple net lease agreement to several solar projects that we account for as equity method investments. As of March 31, 2017, we held the following equity method investments:

Based on an evaluation of our equity method investments, we determined that no OTTI impairment had occurred as of March 31, 2017 or December 31, 2016.