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Fair Value Measurements and Derivative Instruments (Recurring) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets:    
Derivative financial instruments $ 4,994 $ 215,634
Liabilities:    
Derivative financial instruments 141,509 11,210
Fair Value, Measurements, Recurring | Total Fair Value    
Assets:    
Derivative financial instruments 65,297 320,385
Investments 0 3,340
Total Assets 65,297 323,725
Liabilities:    
Derivative financial instruments 201,812 115,961
Contingent consideration 44,000 0
Total Liabilities 245,812 115,961
Fair Value, Measurements, Recurring | Level 1    
Assets:    
Derivative financial instruments 0 0
Investments 0 3,340
Total Assets 0 3,340
Liabilities:    
Derivative financial instruments 0 0
Contingent consideration 0 0
Total Liabilities 0 0
Fair Value, Measurements, Recurring | Level 2    
Assets:    
Derivative financial instruments 65,297 320,385
Investments 0 0
Total Assets 65,297 320,385
Liabilities:    
Derivative financial instruments 201,812 115,961
Contingent consideration 0 0
Total Liabilities 201,812 115,961
Fair Value, Measurements, Recurring | Level 3    
Assets:    
Derivative financial instruments 0 0
Investments 0 0
Total Assets 0 0
Liabilities:    
Derivative financial instruments 0 0
Contingent consideration 44,000 0
Total Liabilities $ 44,000 $ 0