Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details)

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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details) - Recurring Basis - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Assets    
Derivative financial instruments $ 36,241 $ 65,114
Liabilities    
Derivative financial instruments (11,514) (17,920)
Net Derivative Fair Value 24,727 47,194
Level 1    
Assets    
Derivative financial instruments 0 0
Liabilities    
Derivative financial instruments 0 0
Net Derivative Fair Value 0 0
Level 2    
Assets    
Derivative financial instruments 36,241 65,114
Liabilities    
Derivative financial instruments (11,514) (17,920)
Net Derivative Fair Value 24,727 47,194
Level 3    
Assets    
Derivative financial instruments 0 0
Liabilities    
Derivative financial instruments 0 0
Net Derivative Fair Value $ 0 $ 0