Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Cash Deposits Subject to Credit Risk (Details)

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Fair Value Measurements - Cash Deposits Subject to Credit Risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]    
Cash deposits $ 6,208 $ 21,418
Restricted cash deposits (included in other assets) 101,000 38,000
Total cash deposits 107,000 59,000
Amount of cash deposits in excess of amounts federally insured $ 105,000 $ 57,000