Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Benefit Plans [Abstract]
Percentage of matching contribution (in hundredths)	1.50%
Employer contribution to plan	$ 1,027	$ 1,432	$ 1,743
Contribution by European subsidiary to plan	898	897	816
Recorded estimated liability for defined benefit pension plan	1,128	867
Stock issued under employee stock purchase plan (in shares)	28	33	33
Employee stock purchase plan, discount rate for shares issued (in hundredths)	5.00%
Employee stock purchase plan, discount amount for shares issued	19	21	23
Income deferral plan liability	1,697	1,591
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Percentage of workforce collective bargain (in hundredths)	7.00%
Collective bargaining agreements, expiration date first	Dec. 31, 2014
Collective bargaining agreements, expiration date first last	Dec. 31, 2017
Percentage of employees covered by contracts expiring within one year (in hundredths)	2.00%
Pension expense	602	813	912
Board of Directors Chairman [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Deferred compensation contractual term (in years)	10
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%
Period until first assumed payment under deferred compensation agreement	1 year