Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details)

v3.20.1
Derivative Instruments and Hedging Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - Not Designated as Hedging Instrument - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Fair value of derivatives - current    
Offsetting Assets and Liabilities [Line Items]    
Presented without Effects of Netting $ 262,528,000 $ 43,567,000
Effects of Netting (37,863,000) (17,511,000)
As Presented with Effects of Netting 224,665,000 26,056,000
Fair value of derivatives - current | Contingent Consideration Arrangements    
Offsetting Assets and Liabilities [Line Items]    
Presented without Effects of Netting 350,000 16,718,000
Effects of Netting 0 0
As Presented with Effects of Netting 350,000 16,718,000
Fair value of derivatives - current | Contingent consideration arrangement    
Offsetting Assets and Liabilities [Line Items]    
Presented without Effects of Netting 262,178,000 26,849,000
Effects of Netting (37,863,000) (17,511,000)
As Presented with Effects of Netting 224,315,000 9,338,000
Fair value of derivatives - non current    
Offsetting Assets and Liabilities [Line Items]    
Presented without Effects of Netting 2,191,000 9,216,000
Effects of Netting (208,000) 0
As Presented with Effects of Netting 1,983,000 9,216,000
Fair value of derivatives - non current | Contingent Consideration Arrangements    
Offsetting Assets and Liabilities [Line Items]    
Presented without Effects of Netting 1,004,000 9,216,000
Effects of Netting 0 0
As Presented with Effects of Netting 1,004,000 9,216,000
Fair value of derivatives - non current | Contingent consideration arrangement    
Offsetting Assets and Liabilities [Line Items]    
Presented without Effects of Netting 1,187,000 0
Effects of Netting (208,000) 0
As Presented with Effects of Netting 979,000 0
Fair value of derivatives - current    
Offsetting Assets and Liabilities [Line Items]    
Presented without Effects of Netting (42,714,000) (88,708,000)
Effects of Netting 37,863,000 17,511,000
As Presented with Effects of Netting (4,851,000) (71,197,000)
Fair value of derivatives - current | Contingent Consideration Arrangements    
Offsetting Assets and Liabilities [Line Items]    
Presented without Effects of Netting (964,000) (50,000,000)
Effects of Netting 0 0
As Presented with Effects of Netting (964,000) (50,000,000)
Fair value of derivatives - current | Contingent consideration arrangement    
Offsetting Assets and Liabilities [Line Items]    
Presented without Effects of Netting (41,750,000) (38,708,000)
Effects of Netting 37,863,000 17,511,000
As Presented with Effects of Netting (3,887,000) (21,197,000)
Fair value of derivatives - non current    
Offsetting Assets and Liabilities [Line Items]    
Presented without Effects of Netting (4,465,000) (32,695,000)
Effects of Netting 208,000 0
As Presented with Effects of Netting (4,257,000) (32,695,000)
Fair value of derivatives - non current | Contingent Consideration Arrangements    
Offsetting Assets and Liabilities [Line Items]    
Presented without Effects of Netting (2,742,000) (19,760,000)
Effects of Netting 0 0
As Presented with Effects of Netting (2,742,000) (19,760,000)
Fair value of derivatives - non current | Contingent consideration arrangement    
Offsetting Assets and Liabilities [Line Items]    
Presented without Effects of Netting (1,723,000) (12,935,000)
Effects of Netting 208,000 0
As Presented with Effects of Netting $ (1,515,000) $ (12,935,000)