Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investments - Additional Information (Details)

v3.10.0.1
Equity Method Investments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Equity [Abstract]        
Income (loss) from equity method investments $ 10,583 $ 8,377 $ 8,298 $ 12,548