Stockholders' Equity (Changes in AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			$ (79,433)	$ (2,616)
Other comprehensive (loss) income before reclassifications			(38,926)	2,986
Amounts reclassified from accumulated other comprehensive loss			(1,565)	(502)
Other comprehensive income (loss)	$ 17,738	$ 1,650	(40,491)	2,484
Accumulated other comprehensive income (loss), ending balance	(119,924)	(132)	(119,924)	(132)
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) income before reclassifications			(115)	(20)
Amounts reclassified from accumulated other comprehensive loss			867	275
Other comprehensive income (loss)			752	255
Accumulated other comprehensive income (loss), ending balance	(22,690)	(6,441)	(22,690)	(6,441)
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) income before reclassifications			(41,826)	(90)
Amounts reclassified from accumulated other comprehensive loss			0	0
Other comprehensive income (loss)			(41,826)	(90)
Accumulated other comprehensive income (loss), ending balance	(98,050)	3,814	(98,050)	3,814
Net Unrealized Holding Gains on Investments, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			233	176
Other comprehensive (loss) income before reclassifications			3,015	3,096
Amounts reclassified from accumulated other comprehensive loss			(2,432)	(777)
Other comprehensive income (loss)			583	2,319
Accumulated other comprehensive income (loss), ending balance	$ 816	$ 2,495	$ 816	$ 2,495