Stock-Based Compensation and Equity - Reclassifications Out of Accumulated Other Comprehensive Loss Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reconciliation Of Accumulated Comprehensive Income
Balance - beginning of period			$ 3,425,140	$ 3,561,428
Amounts reclassified from accumulated other comprehensive loss to:
Interest expense	$ 42,235	$ 46,752	84,192	95,147
Net current period other comprehensive loss	11,253	(35,335)	20,077	(33,077)
Balance - end of period	3,456,238	3,463,000	3,456,238	3,463,000
Accumulated Other Comprehensive Income (Loss)
Reconciliation Of Accumulated Comprehensive Income
Balance - beginning of period	(246,234)	(171,903)	(254,485)	(172,291)
Other comprehensive income before reclassifications	13,769	(33,913)	25,640	(30,148)
Amounts reclassified from accumulated other comprehensive loss to:
Amount reclassified from accumulated other comprehensive income (loss)	(2,516)	(1,422)	(5,563)	(2,929)
Net current period other comprehensive loss	11,253	(35,335)	20,077	(33,077)
Net current period other comprehensive (gain) loss attributable to noncontrolling interests	(8,667)	1,037	(9,240)	(833)
Balance - end of period	(243,648)	(206,201)	(243,648)	(206,201)
Accumulated Other Comprehensive Income (Loss) | Amounts reclassified from accumulated other comprehensive loss to:
Amounts reclassified from accumulated other comprehensive loss to:
Interest expense	340	531	738	1,066
Other income and (expenses)	(2,856)	(1,953)	(6,301)	(3,995)
Gains and Losses on Derivative Instruments
Reconciliation Of Accumulated Comprehensive Income
Balance - beginning of period	41,259	25,875	46,935	37,650
Other comprehensive income before reclassifications	(14,115)	10,291	(16,741)	23
Amounts reclassified from accumulated other comprehensive loss to:
Amount reclassified from accumulated other comprehensive income (loss)	(2,516)	(1,422)	(5,563)	(2,929)
Net current period other comprehensive loss	(16,631)	8,869	(22,304)	(2,906)
Net current period other comprehensive (gain) loss attributable to noncontrolling interests	8	0	5	0
Balance - end of period	24,636	34,744	24,636	34,744
Gains and Losses on Derivative Instruments | Amounts reclassified from accumulated other comprehensive loss to:
Amounts reclassified from accumulated other comprehensive loss to:
Interest expense	340	531	738	1,066
Other income and (expenses)	(2,856)	(1,953)	(6,301)	(3,995)
Foreign Currency Translation Adjustments
Reconciliation Of Accumulated Comprehensive Income
Balance - beginning of period	(287,150)	(197,814)	(301,330)	(209,977)
Other comprehensive income before reclassifications	27,957	(44,208)	42,707	(30,175)
Amounts reclassified from accumulated other comprehensive loss to:
Amount reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Net current period other comprehensive loss	27,957	(44,208)	42,707	(30,175)
Net current period other comprehensive (gain) loss attributable to noncontrolling interests	(8,675)	1,037	(9,245)	(833)
Balance - end of period	(267,868)	(240,985)	(267,868)	(240,985)
Foreign Currency Translation Adjustments | Amounts reclassified from accumulated other comprehensive loss to:
Amounts reclassified from accumulated other comprehensive loss to:
Interest expense	0	0	0	0
Other income and (expenses)	0	0	0	0
Gains and Losses on Marketable Securities
Reconciliation Of Accumulated Comprehensive Income
Balance - beginning of period	(343)	36	(90)	36
Other comprehensive income before reclassifications	(73)	4	(326)	4
Amounts reclassified from accumulated other comprehensive loss to:
Amount reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Net current period other comprehensive loss	(73)	4	(326)	4
Net current period other comprehensive (gain) loss attributable to noncontrolling interests	0	0	0	0
Balance - end of period	(416)	40	(416)	40
Gains and Losses on Marketable Securities | Amounts reclassified from accumulated other comprehensive loss to:
Amounts reclassified from accumulated other comprehensive loss to:
Interest expense	0	0	0	0
Other income and (expenses)	$ 0	$ 0	$ 0	$ 0