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Fair Value Measurements - Derivative Instrument Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets    
Derivative instruments, at fair value $ 315,564 $ 241,952
Fair value on a recurring basis | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Derivative instruments, at fair value 7,661 0
Liabilities    
Derivative instruments, at fair value 12,058 0
Fair value on a recurring basis | Significant other observable inputs (Level 2)    
Assets    
Derivative instruments, at fair value 307,903 241,952
Liabilities    
Derivative instruments, at fair value 171,619 139,089
Fair value on a recurring basis | Significant unobservable inputs (Level 3)    
Assets    
Derivative instruments, at fair value 0 0
Liabilities    
Derivative instruments, at fair value 0 0
Fair value on a recurring basis | Fair value    
Assets    
Derivative instruments, at fair value 315,564 241,952
Liabilities    
Derivative instruments, at fair value $ 183,677 $ 139,089