Summary of Significant Accounting Policies (Schedule of Change in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 7,067,009	$ 5,783,487	$ 4,860,863
Ending balance	7,440,059	7,067,009	5,783,487
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(547,927)	(825,354)	(788,652)
Current period other comprehensive income (loss) before reclassifications	(234,175)	277,427	(36,702)
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Ending balance	(782,102)	(547,927)	(825,354)
Pensions and post-retirement benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(10,600)	(7,673)	(4,916)
Current period other comprehensive income (loss) before reclassifications	1,094	(2,927)	(2,757)
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Ending balance	(9,506)	(10,600)	(7,673)
AOCI including portion attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(558,527)	(833,027)	(793,568)
Current period other comprehensive income (loss) before reclassifications	(233,081)	274,500	(39,459)
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Ending balance	$ (791,608)	$ (558,527)	$ (833,027)

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

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