Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Changes in accumulated other comprehensive income (loss), net of tax
Balance at the beginning of the period			$ (13,183)
Other comprehensive income (loss) before reclassifications			(4,425)
Amounts reclassified from accumulated other comprehensive income			678
Other comprehensive gain (loss), net of tax	(2,303)	2,052	(3,747)	(106)
Balance at the end of the period	(16,930)		(16,930)
Accumulated Defined Benefit Plans Adjustment [Member]
Changes in accumulated other comprehensive income (loss), net of tax
Balance at the beginning of the period			(8,445)
Other comprehensive income (loss) before reclassifications			(2,194)
Amounts reclassified from accumulated other comprehensive income			678
Other comprehensive gain (loss), net of tax			(1,516)
Balance at the end of the period	(9,961)		(9,961)
Accumulated Translation Adjustment [Member]
Changes in accumulated other comprehensive income (loss), net of tax
Balance at the beginning of the period			(5,069)
Other comprehensive income (loss) before reclassifications			(2,156)
Amounts reclassified from accumulated other comprehensive income			0
Other comprehensive gain (loss), net of tax			(2,156)
Balance at the end of the period	(7,225)		(7,225)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Changes in accumulated other comprehensive income (loss), net of tax
Balance at the beginning of the period			331
Other comprehensive income (loss) before reclassifications			(75)
Amounts reclassified from accumulated other comprehensive income			0
Other comprehensive gain (loss), net of tax			(75)
Balance at the end of the period	$ 256		$ 256