Stockholder's Equity (Details 4) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized gains (losses) on cash flow hedges		$ (2)	$ (1,416)	$ (650)
Unrecognized gains (losses) on equity investments		5,120	0	0
Unrecognized gains (losses) on foreign currency translation		(173,496)	(85,484)	(74,770)
Unrecognized actuarial losses		(1,153)	(1,343)	(1,589)
Totals		(169,531)	(88,243)	$ (77,009)
Other comprehensive income before reclassification adjustments
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized gains (losses) on cash flow hedges		1,414	(2,626)
Unrecognized gains (losses) on equity investments		5,120	0
Unrecognized gains (losses) on foreign currency translation		(90,528)	(10,714)
Unrecognized actuarial losses		190	246
Totals		(83,804)	(13,094)
Reclassification amount to net income
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized gains (losses) on cash flow hedges	[1]	0	1,860
Unrecognized gains (losses) on equity investments		0	0
Unrecognized gains (losses) on foreign currency translation		2,516	0
Unrecognized actuarial losses		0	0
Totals		2,516	1,860
Net current period other comprehensive income
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized gains (losses) on cash flow hedges		1,414	(766)
Unrecognized gains (losses) on equity investments		5,120	0
Unrecognized gains (losses) on foreign currency translation		(88,012)	(10,714)
Unrecognized actuarial losses		190	246
Totals		$ (81,288)	$ (11,234)

[1] Please see Note 11 for additional information.