Stockholder's Equity (Details 2) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges		$ 0	$ (2)	$ (45)	$ (1,416)
Unrecognized losses on equity investments		(15,165)	5,120	(5,252)	0
Unrecognized gains (losses) on foreign currency translation		(124,922)	(173,496)	(144,544)	(85,484)
Unrecognized actuarial losses		(1,153)	(1,153)	(1,343)	(1,343)
Totals		(141,240)	$ (169,531)	(151,184)	$ (88,243)
Other comprehensive income before reclassification adjustments
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges		2		11
Unrecognized losses on equity investments		(20,285)		(5,252)
Unrecognized gains (losses) on foreign currency translation		48,574		(59,060)
Unrecognized actuarial losses		0		0
Totals		28,291		(64,301)
Reclassification amount to net income
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges	[1]			1,360
Unrecognized losses on equity investments				0
Unrecognized gains (losses) on foreign currency translation				0
Unrecognized actuarial losses				0
Totals				1,360
Net current period other comprehensive income
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges		2		1,371
Unrecognized losses on equity investments		(20,285)		(5,252)
Unrecognized gains (losses) on foreign currency translation		48,574		(59,060)
Unrecognized actuarial losses		0		0
Totals		$ 28,291		$ (62,941)

[1] Please see Note 11 for additional information.