Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Benefit Plans [Abstract]
Percentage of matching contribution (in hundredths)	1.50%
Employer contribution to plan	$ 1,432	$ 1,743	$ 2,060
Contribution by European subsidiary to plan	897	816	771
Recorded estimated liability for defined benefit pension plan	867	778
Stock issued under employee stock purchase plan (in shares)	33	33	26
Employee stock purchase plan, discount rate for shares issued (in hundredths)	5.00%
Employee stock purchase plan, discount amount for shares issued	21	23	23
Income deferral plan liability	1,591	1,375
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Period until first assumed payment under deferred compensation agreement	1 year
Percentage of workforce collective bargain (in hundredths)	8.00%
Collective bargaining agreements, expiration date first	Dec. 31, 2013
Collective bargaining agreements, expiration date first last	Dec. 31, 2015
Percentage of employees covered by contracts expiring within one year (in hundredths)	3.00%
Pension expense	813	912	972
Board of Directors Chairman [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Deferred compensation contractual term (in years)	10Y
Percentage of final salary equal to deferred compensation (in hundredths)	50.00%
Deferred compensation liability	$ 815	$ 815
Number of annual payments for which liability was calculated	10
Assumed rate of discount (in hundredths)	6.00%