Stockholder's Equity (Details 2) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges		$ (933)	$ (1,416)	$ (2,809)	$ (650)
Unrecognized losses on equity investments		(7,549)	0	(11,687)	0
Unrecognized gains (losses) on foreign currency translation		(99,230)	(85,484)	(91,411)	(74,770)
Unrecognized actuarial losses		(1,341)	(1,343)	(1,589)	(1,589)
Totals		(109,053)	$ (88,243)	(107,496)	$ (77,009)
Other comprehensive income before reclassification adjustments
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges		0		(2,625)
Unrecognized losses on equity investments		(7,549)		(11,687)
Unrecognized gains (losses) on foreign currency translation		(13,746)		(16,641)
Unrecognized actuarial losses		2		0
Totals		(21,293)		(30,953)
Reclassification amount to net income
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges	[1]	483		466
Unrecognized losses on equity investments		0		0
Unrecognized gains (losses) on foreign currency translation		0		0
Unrecognized actuarial losses		0		0
Totals		483		466
Net current period other comprehensive income
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges		483		(2,159)
Unrecognized losses on equity investments		(7,549)		(11,687)
Unrecognized gains (losses) on foreign currency translation		(13,746)		(16,641)
Unrecognized actuarial losses		2		0
Totals		$ (20,810)		$ (30,487)

[1] (1) Please see note 11 for additional information.