Accumulated Other Comprehensive Income Changes in AOCI (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			$ (2,616)	$ (10,840)	$ (10,840)
Other comprehensive loss before reclassifications			(33,462)	(1,314)
Amounts reclassified from accumulated other comprehensive loss			(355)	1,233
Other comprehensive (loss) income	(36,301)	805	(33,817)	(81)	8,224
Accumulated other comprehensive income (loss), ending balance	(36,433)	(10,921)	(36,433)	(10,921)	(2,616)
Benefits Liability, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			(6,696)	(16,351)	(16,351)
Other comprehensive loss before reclassifications			(39)	(601)
Amounts reclassified from accumulated other comprehensive loss			422	1,233
Other comprehensive (loss) income			383	632
Accumulated other comprehensive income (loss), ending balance	(6,313)	(15,719)	(6,313)	(15,719)
Cumulative Foreign Currency Exchange
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			3,904	5,511	5,511
Other comprehensive loss before reclassifications			(37,882)	(844)
Amounts reclassified from accumulated other comprehensive loss			0	0
Other comprehensive (loss) income			(37,882)	(844)
Accumulated other comprehensive income (loss), ending balance	(33,978)	4,667	(33,978)	4,667
Net Unrealized Holding Gains on Investmetnts, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			176	0	0
Other comprehensive loss before reclassifications			4,459	131
Amounts reclassified from accumulated other comprehensive loss			(777)	0
Other comprehensive (loss) income			3,682	131
Accumulated other comprehensive income (loss), ending balance	$ 3,858	$ 131	$ 3,858	$ 131