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)

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