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Equity Method Investments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 20, 2019
Feb. 20, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Apr. 01, 2010
Equity Method Investments              
Return of capital from equity method investments         $ 2,848 $ 2,737  
Income (loss) from equity method investments     $ 719 $ 2,226 1,432 3,114  
Corporate Joint Venture              
Equity Method Investments              
Ownership percentage             50.00%
Return of capital from equity method investments $ 2,848 $ 2,737          
Income (loss) from equity method investments     $ 719 $ 2,226 $ 1,432 $ 3,114