Equity (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (145,770)	$ (17,134)	$ (81,007)	$ (13,442)
Other comprehensive (loss) income before reclassifications	24,308	(9,182)	(40,835)	(14,889)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	610	2,365	(234)	4,525
Net current-period Other comprehensive income (loss)	24,918	(6,817)	(41,069)	(10,364)
Net current-period Other comprehensive income attributable to noncontrolling interests	(490)	(67)	734	(212)
Ending balance	(121,342)	(24,018)	(121,342)	(24,018)
Interest Expense
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1,847	2,572	4,131	4,619
Other income and (expense)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(1,237)	(207)	(4,365)	(94)
Gains and Losses on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	30,047	(19,377)	7,311	(16,717)
Other comprehensive (loss) income before reclassifications	(4,539)	(4,195)	19,041	(8,866)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	610	2,365	(234)	4,525
Net current-period Other comprehensive income (loss)	(3,929)	(1,830)	18,807	(4,341)
Net current-period Other comprehensive income attributable to noncontrolling interests	0	(160)	0	(309)
Ending balance	26,118	(21,367)	26,118	(21,367)
Gains and Losses on Derivative Instruments | Interest Expense
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1,847	2,572	4,131	4,619
Gains and Losses on Derivative Instruments | Other income and (expense)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(1,237)	(207)	(4,365)	(94)
Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(99)	(367)	(106)	(391)
Other comprehensive (loss) income before reclassifications	7	23	14	47
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0
Net current-period Other comprehensive income (loss)	7	23	14	47
Net current-period Other comprehensive income attributable to noncontrolling interests	0	0	0	0
Ending balance	(92)	(344)	(92)	(344)
Gains and Losses on Marketable Securities | Interest Expense
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0
Gains and Losses on Marketable Securities | Other income and (expense)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(175,718)	2,610	(88,212)	3,666
Other comprehensive (loss) income before reclassifications	28,840	(5,010)	(59,890)	(6,070)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0
Net current-period Other comprehensive income (loss)	28,840	(5,010)	(59,890)	(6,070)
Net current-period Other comprehensive income attributable to noncontrolling interests	(490)	93	734	97
Ending balance	(147,368)	(2,307)	(147,368)	(2,307)
Foreign Currency Translation Adjustments | Interest Expense
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0
Foreign Currency Translation Adjustments | Other income and (expense)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 0	$ 0	$ 0	$ 0