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Fair Value of Financial Instruments - Changes in Unrealized Gains (Losses) Included in Earnings for Level 3 (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net change in unrealized gains included in earnings for assets and liabilities $ 2,353 $ 738 $ 5,184 $ 2,340
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Change in unrealized (losses) gains – assets (19,767) (17,722) 56,995 237,934
Change in unrealized gains (losses) – liabilities 22,120 18,460 (51,811) (235,594)
Net change in unrealized gains included in earnings for assets and liabilities $ 2,353 $ 738 $ 5,184 $ 2,340