Accumulated Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2016		Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance					$ (136,057)		$ (79,248)
Foreign currency translation adjustment	$ (18,389)		$ 24,119		(3,004)		(36,706)
Other comprehensive (loss) before reclassifications					(5,679)		(37,175)
Amounts reclassified from accumulated other comprehensive loss					332		1,839
Net current-period other comprehensive (loss) income, before income taxes	(19,154)		24,793		(5,347)		(35,336)
Income tax (expense) benefit	(8,312)		5,943		(10,211)		3,664
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent					(15,558)		(31,672)
Ending balance	(151,615)		(110,920)		(151,615)		(110,920)
Cash Flow Hedging [Member] | Interest Expense [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	169	[1]	871	[1]	332	[2]	1,839	[2]
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(934)		(197)		(2,675)		(469)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance					(136,434)		(77,492)
Amounts reclassified from accumulated other comprehensive loss					0		0
Net current-period other comprehensive (loss) income, before income taxes					(3,004)		(36,706)
Income tax (expense) benefit					(11,069)		4,165
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent					(14,073)		(32,541)
Ending balance	(150,507)		(110,033)		(150,507)		(110,033)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance					377		(1,756)
Net current-period other comprehensive (loss) income, before income taxes					(2,343)		1,370
Income tax (expense) benefit					858		(501)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent					(1,485)		869
Ending balance	$ (1,108)		$ (887)		$ (1,108)		$ (887)

[1] There were no gains or losses recognized in earnings related to any ineffective portion of hedging relationships or related to any amount excluded from the assessment of hedge effectiveness for the three months ended June 30, 2016 and 2015.

[2] There were no gains or losses recognized in earnings related to any ineffective portion of hedging relationships or related to any amount excluded from the assessment of hedge effectiveness for the six months ended June 30, 2016 and 2015.