Summary of Siginificant Accounting Policies (Schedule of Change in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (429,321)	$ 178,689	$ 159,733
Current period other comprehensive income (loss) before reclassifications	(364,247)	(608,010)	18,956
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Ending balance	(793,568)	(429,321)	178,689
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(428,505)	178,846	160,661
Current period other comprehensive income (loss) before reclassifications	(360,147)	(607,351)	18,185
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Ending balance	(788,652)	(428,505)	178,846
Pensions
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(816)	(157)	(928)
Current period other comprehensive income (loss) before reclassifications	(4,100)	(659)	771
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Ending balance	$ (4,916)	$ (816)	$ (157)