Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (25,376)	$ (6,919)
Reclassification adjustment for amounts recognized in net income	(1,809)	7,564	$ 9,339
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for amounts recognized in net income	(1,809)	7,564	9,339
Amount of gain/loss on interest rate contract reclassfied from AOCI	(1,133)	2,879	5,823
Amount of gain/loss on interest rate contract reclassfied from AOCI for unconsolidated joint ventures	188	2,406	3,775
Amount of gain/loss on cross-currency interest rate contract reclassified from AOCI for Unconsolidated Joint Ventures	(864)	2,279	(259)
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(16,128)	384	(23,147)	$ (10,890)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(9,248)	(7,303)	(12,769)	(16,330)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(25,376)	(6,919)	(35,916)	(27,220)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	(16,513)	23,615	(12,251)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(26)	41	(3,044)
OCI, before Reclassifications, Net of Tax, Attributable to Parent	(16,539)	23,656	(15,295)
Reclassification adjustment for amounts recognized in net income	(1,286)	5,364	6,598
Cumulative Translation Adjustment, Net of Tax, Period Increase (Decrease)	(16,513)	23,615	(12,251)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	(1,312)	5,405	3,554
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(17,825)	29,020	(8,697)
Cumulative Effect New Accounting Principle In Period Of Adoption	(679)
OtherComprehensiveIncomeLossAdjustmentForeignCurrencyAttributableToParent	1	(84)	(6)
Other comprehensive income (loss), adjustments, attributable to parent	46	61	7
Other comprehensive income (loss), total adjustments attributable to parent	47	(23)	1
Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(6,569)	159	(9,613)	(4,531)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	8,363	9,220	7,065	5,595
Accumulated Other Comprehensive Income (Loss), Net of Tax	1,794	9,379	(2,548)	$ 1,064
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	(6,727)	9,688	(5,088)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(12)	16	(1,264)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Noncontrolling Interest	(6,739)	9,704	(6,352)
Reclassification adjustment for amounts recognized in net income	(523)	2,200	2,741
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest	(6,727)	9,688	(5,088)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Noncontrolling Interest	(535)	2,216	1,477
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(7,262)	11,904	(3,611)
Cumulative Effect New Accounting Principle In Period Of Adoption	(276)
Other Comprehensive Income Loss Adjustment Foreign Currency Attributable To Noncontrolling Interest	(1)	84	6
Other comprehensive income (loss), adjustments, attributable to noncontrolling interests	(46)	(61)	(7)
Other comprehensive income (loss), total adjustments attributable to noncontrolling interests	$ (47)	$ 23	$ (1)