Summary of Significant Accounting Policies (Schedule of Change in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 7,440,059	$ 7,067,009	$ 5,783,487
Ending balance	8,126,448	7,440,059	7,067,009
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(782,102)	(547,927)	(825,354)
Current period other comprehensive income (loss) before reclassifications	28,994	(234,175)	277,427
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Ending balance	(753,108)	(782,102)	(547,927)
Pensions and post-retirement benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(9,506)	(10,600)	(7,673)
Current period other comprehensive income (loss) before reclassifications	(3,210)	1,094	(2,927)
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Ending balance	(12,716)	(9,506)	(10,600)
AOCI including portion attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(791,608)	(558,527)	(833,027)
Current period other comprehensive income (loss) before reclassifications	25,784	(233,081)	274,500
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Ending balance	$ (765,824)	$ (791,608)	$ (558,527)

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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