Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details) - Recurring Basis - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Assets    
Derivative financial instruments $ 24,843 $ 65,114
Liabilities    
Derivative financial instruments (20,914) (17,920)
Net Derivative Fair Value 3,929 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 24,843 65,114
Liabilities    
Derivative financial instruments (20,914) (17,920)
Net Derivative Fair Value 3,929 47,194
Level 3    
Assets    
Derivative financial instruments 0 0
Liabilities    
Derivative financial instruments 0 0
Net Derivative Fair Value $ 0 $ 0