Stockholders' Equity AOCI Change (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Beginning Balance	$ (18,905)		$ (20,693)		$ (18,743)		$ (21,071)
Other comprehensive income (loss) before reclassifications	1,041		(2,533)		626		(2,500)
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax	254	[1]	345	[1]	507	[1]	690	[1]
Net current period other comprehensive income (loss)	1,295		(2,188)		1,133		(1,810)
Ending Balance	(17,610)		(22,881)		(17,610)		(22,881)
Defined Benefit Pension and Postretirement Items
Accumulated Other Comprehensive Loss, Pension and Other Postretirement Benefit Plans, Net of Tax	(13,619)		(18,059)		(13,619)		(18,059)		(13,873)	(14,126)	(18,404)	(18,749)
Other comprehensive income (loss) before reclassifications	0		0		0		0
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax	254	[1]	345	[1]	507	[1]	690	[1]
Net current period other comprehensive income (loss)	254		345		507		690
Foreign Currency Items
Accumulated Other Comprehensive Loss, Foreign Currency Translation Adjustment, Net of Tax	(3,991)		(4,822)		(3,991)		(4,822)		(5,032)	(4,617)	(2,289)	(2,322)
Other comprehensive income (loss) before reclassifications	1,041		(2,533)		626		(2,500)
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax	0	[1]	0	[1]	0	[1]	0	[1]
Net current period other comprehensive income (loss)	$ 1,041		$ (2,533)		$ 626		$ (2,500)

[1] See reclassifications from accumulated other comprehensive loss table for details of reclassification from accumulated other comprehensive loss for the three and six months ended June 30, 2014 and 2013.