Accumulated Other Comprehensive Income Changes in AOCI (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	$ (10,840)
Other comprehensive loss before reclassifications	(1,314)
Amounts reclassified from accumulated other comprehensive loss	1,233
Net other comprehensive income (loss) for the period	(81)
Accumulated other comprehensive income (loss), ending balance	(10,921)
Benefits Liability, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(16,351)
Other comprehensive loss before reclassifications	(601)
Amounts reclassified from accumulated other comprehensive loss	1,233
Net other comprehensive income (loss) for the period	632
Accumulated other comprehensive income (loss), ending balance	(15,719)
Cumulative Foreign Currency Exchange
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance	5,511
Other comprehensive loss before reclassifications	(844)
Amounts reclassified from accumulated other comprehensive loss	0
Net other comprehensive income (loss) for the period	(844)
Accumulated other comprehensive income (loss), ending balance	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	0
Other comprehensive loss before reclassifications	131
Amounts reclassified from accumulated other comprehensive loss	0
Net other comprehensive income (loss) for the period	131
Accumulated other comprehensive income (loss), ending balance	$ 131