Summary of Significant Accounting Policies (Schedule of Accumulated Other Comprehensive Income (loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (150,195)	$ (90,288)
Other comprehensive income (loss) before reclassifications	(70,934)	(66,501)
Amounts reclassified from accumulated other comprehensive income (loss)	12,410	6,594
Other comprehensive income (loss)	(58,524)	(59,907)	$ 12,059
Ending balance	(208,719)	(150,195)	(90,288)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(47,270)	(19,205)
Other comprehensive income (loss) before reclassifications	(65,537)	(28,065)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive income (loss)	(65,537)	(28,065)
Ending balance	(112,807)	(47,270)	(19,205)
Gain (loss) on derivative financial instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	656	765
Other comprehensive income (loss) before reclassifications	(3,221)	294
Amounts reclassified from accumulated other comprehensive income (loss)	2,192	(403)
Other comprehensive income (loss)	(1,029)	(109)
Ending balance	(373)	656	765
Pension and other post-retirement benefit adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(103,581)	(71,848)
Other comprehensive income (loss) before reclassifications	(2,176)	(38,730)
Amounts reclassified from accumulated other comprehensive income (loss)	10,218	6,997
Other comprehensive income (loss)	8,042	(31,733)
Ending balance	$ (95,539)	$ (103,581)	$ (71,848)