Fair Value Measurements (Fair Value of Assets and liabilities Measured on a Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets:
Convertible notes receivable	$ 2,775
Total assets	78,025	$ 561
Liabilities:
Contingent consideration arrangements	103,818	137,349
Total liabilities	234,025	141,029
Embedded Derivative Financial Instruments
Liabilities:
Derivative liability	121,756
Other Contract
Liabilities:
Derivative liability	4,290
Designated as Hedging Instrument | Foreign Exchange Contract
Assets:
Derivative asset	2,893	535
Liabilities:
Derivative liability	14	169
Designated as Hedging Instrument | Interest Rate Swap Contracts
Liabilities:
Derivative liability		374
Not Designated as Hedging Instrument
Assets:
Derivative asset	72,302
Not Designated as Hedging Instrument | Foreign Exchange Contract
Assets:
Derivative asset		26
Not Designated as Hedging Instrument | Interest Rate Swap Contracts
Liabilities:
Derivative liability	74
Not Designated as Hedging Instrument | Freestanding Instrument
Assets:
Derivative asset	55
Liabilities:
Derivative liability	4,073	3,137
Level 1
Assets:
Convertible notes receivable	0
Total assets	0	0
Liabilities:
Contingent consideration arrangements	0	0
Total liabilities	0	0
Level 1 | Embedded Derivative Financial Instruments
Liabilities:
Derivative liability	0
Level 1 | Other Contract
Liabilities:
Derivative liability	0
Level 1 | Designated as Hedging Instrument | Foreign Exchange Contract
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Level 1 | Designated as Hedging Instrument | Interest Rate Swap Contracts
Liabilities:
Derivative liability		0
Level 1 | Not Designated as Hedging Instrument
Assets:
Derivative asset	0
Level 1 | Not Designated as Hedging Instrument | Foreign Exchange Contract
Assets:
Derivative asset		0
Level 1 | Not Designated as Hedging Instrument | Interest Rate Swap Contracts
Liabilities:
Derivative liability	0
Level 1 | Not Designated as Hedging Instrument | Freestanding Instrument
Assets:
Derivative asset	0
Liabilities:
Derivative liability	0	0
Level 2
Assets:
Convertible notes receivable	0
Total assets	2,948	561
Liabilities:
Contingent consideration arrangements	0	0
Total liabilities	4,161	3,680
Level 2 | Embedded Derivative Financial Instruments
Liabilities:
Derivative liability	0
Level 2 | Other Contract
Liabilities:
Derivative liability	0
Level 2 | Designated as Hedging Instrument | Foreign Exchange Contract
Assets:
Derivative asset	2,893	535
Liabilities:
Derivative liability	14	169
Level 2 | Designated as Hedging Instrument | Interest Rate Swap Contracts
Liabilities:
Derivative liability		374
Level 2 | Not Designated as Hedging Instrument
Assets:
Derivative asset	0
Level 2 | Not Designated as Hedging Instrument | Foreign Exchange Contract
Assets:
Derivative asset		26
Level 2 | Not Designated as Hedging Instrument | Interest Rate Swap Contracts
Liabilities:
Derivative liability	74
Level 2 | Not Designated as Hedging Instrument | Freestanding Instrument
Assets:
Derivative asset	55
Liabilities:
Derivative liability	4,073	3,137
Level 3
Assets:
Convertible notes receivable	2,775
Total assets	75,077	0
Liabilities:
Contingent consideration arrangements	103,818	137,349
Total liabilities	229,864	137,349
Level 3 | Embedded Derivative Financial Instruments
Liabilities:
Derivative liability	121,756
Level 3 | Other Contract
Liabilities:
Derivative liability	4,290
Level 3 | Designated as Hedging Instrument | Foreign Exchange Contract
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Level 3 | Designated as Hedging Instrument | Interest Rate Swap Contracts
Liabilities:
Derivative liability		0
Level 3 | Not Designated as Hedging Instrument
Assets:
Derivative asset	72,302
Level 3 | Not Designated as Hedging Instrument | Foreign Exchange Contract
Assets:
Derivative asset		0
Level 3 | Not Designated as Hedging Instrument | Interest Rate Swap Contracts
Liabilities:
Derivative liability	0
Level 3 | Not Designated as Hedging Instrument | Freestanding Instrument
Assets:
Derivative asset	0
Liabilities:
Derivative liability	$ 0	$ 0