Stockholder's Equity (Details 2) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges		$ (2)	$ (2)	$ (446)	$ (1,416)
Unrecognized losses on equity investments		(11,357)	5,120	(11,160)	0
Unrecognized gains (losses) on foreign currency translation		(151,112)	(173,496)	(146,691)	(85,484)
Unrecognized actuarial losses		(1,153)	(1,153)	(1,341)	(1,343)
Totals		(163,624)	$ (169,531)	(159,638)	$ (88,243)
Other comprehensive income before reclassification adjustments
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges		0		10
Unrecognized losses on equity investments		(16,477)		(11,160)
Unrecognized gains (losses) on foreign currency translation		22,384		(61,207)
Unrecognized actuarial losses		0		2
Totals		5,907		(72,355)
Reclassification amount to net income
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges	[1]			960
Unrecognized losses on equity investments				0
Unrecognized gains (losses) on foreign currency translation				0
Unrecognized actuarial losses				0
Totals				960
Net current period other comprehensive income
Summary of accumulated other comprehensive income/(loss) [Line Items]
Unrecognized losses on cash flow hedges		0		970
Unrecognized losses on equity investments		(16,477)		(11,160)
Unrecognized gains (losses) on foreign currency translation		22,384		(61,207)
Unrecognized actuarial losses		0		2
Totals		$ 5,907		$ (71,395)

[1] Please see Note 11 for additional information.