Derivative Instruments - Fair Value Amounts of Derivative Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets	$ 8,890	$ 109,494
Gross Amounts Offset in the Balance Sheet	(4,974)	(1,039)
Net Amounts of Assets Presented in the Balance Sheet	3,916	108,455
Gross Amounts of Recognized Liabilities	(10,056)	(1,039)
Gross Amounts Offset in the Balance Sheet	4,974	1,039
Net Amounts of Liabilities Presented in the Balance Sheet	(5,082)	0
Derivative assets current
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets	8,477	82,205
Gross Amounts Offset in the Balance Sheet	(4,561)	(1,039)
Net Amounts of Assets Presented in the Balance Sheet	3,916	81,166
Derivative assets non-current
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets	413	27,289
Gross Amounts Offset in the Balance Sheet	(413)	0
Net Amounts of Assets Presented in the Balance Sheet	0	27,289
Derivative liabilities
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Liabilities	(8,972)	(1,039)
Gross Amounts Offset in the Balance Sheet	4,561	1,039
Net Amounts of Liabilities Presented in the Balance Sheet	(4,411)	0
Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Liabilities	(1,084)	0
Gross Amounts Offset in the Balance Sheet	413	0
Net Amounts of Liabilities Presented in the Balance Sheet	$ (671)	$ 0