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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 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 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 $ 5,714 $ 12,303 $ 12,019 $ 7,545 $ 268 $ 1,192 $ (1,051) $ 1,546 $ 37,581 $ 18,872 $ 3,032
Level 3                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Change in unrealized (losses) gains – assets                 (77,007) 12,402 13,865
Change in unrealized gains (losses) – liabilities                 122,696 8,851 (7,762)
Net change in unrealized gains included in earnings for assets and liabilities                 $ 45,689 $ 21,253 $ 6,103