Stockholder's Equity (Details 2) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges		$ (2)	$ (2)	$ (933)	$ (1,416)
Unrecognized losses on equity investments		(5,449)	5,120	(7,549)	0
Unrecognized gains (losses) on foreign currency translation		(170,596)	(173,496)	(99,230)	(85,484)
Unrecognized actuarial losses		(1,153)	(1,153)	(1,341)	(1,343)
Totals		(177,200)	$ (169,531)	(109,053)	$ (88,243)
Other comprehensive income before reclassification adjustments
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges		0		0
Unrecognized losses on equity investments		(10,569)		(7,549)
Unrecognized gains (losses) on foreign currency translation		2,900		(13,746)
Unrecognized actuarial losses		0		2
Totals		(7,669)		(21,293)
Reclassification amount to net income
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges	[1]			483
Unrecognized losses on equity investments				0
Unrecognized gains (losses) on foreign currency translation				0
Unrecognized actuarial losses				0
Totals				483
Net current period other comprehensive income
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges		0		483
Unrecognized losses on equity investments		(10,569)		(7,549)
Unrecognized gains (losses) on foreign currency translation		2,900		(13,746)
Unrecognized actuarial losses		0		2
Totals		$ (7,669)		$ (20,810)

[1] Please see Note 11 for additional information.