Stockholders' Equity (Changes in AOCI) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	$ (79,433)	$ (2,616)
Other comprehensive loss before reclassifications	(58,656)	683
Amounts reclassified from accumulated other comprehensive loss	427	151
Other comprehensive (loss) income	(58,229)	834
Accumulated other comprehensive income (loss), ending balance	(137,662)	(1,782)
Benefits Liability, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(23,442)	(6,696)
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	427	135
Other comprehensive (loss) income	427	135
Accumulated other comprehensive income (loss), ending balance	(23,015)	(6,561)
Cumulative Foreign Currency Exchange
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(56,224)	3,904
Other comprehensive loss before reclassifications	(59,698)	(898)
Amounts reclassified from accumulated other comprehensive loss	0	0
Other comprehensive (loss) income	(59,698)	(898)
Accumulated other comprehensive income (loss), ending balance	(115,922)	3,006
Net Unrealized Holding Gains on Investmetnts, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	233	176
Other comprehensive loss before reclassifications	1,042	1,581
Amounts reclassified from accumulated other comprehensive loss	0	16
Other comprehensive (loss) income	1,042	1,597
Accumulated other comprehensive income (loss), ending balance	$ 1,275	$ 1,773