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Pension and Postretirement Benefits (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Pension Plans [Member]
    
Net periodic benefit cost of pension and post retirement benefit plans    
Service cost $ 30 $ 27
Interest cost 261 297
Expected return on plan assets (100) (151)
Recognized net actuarial loss 149 130
Net periodic benefit cost 340 303
Postretirement Benefit Plans [Member]
    
Net periodic benefit cost of pension and post retirement benefit plans    
Service cost 46 37
Interest cost 173 197
Expected return on plan assets   (22)
Amortization of prior service credit (225) (278)
Recognized net actuarial loss 141 154
Net periodic benefit cost 135 88
Foreign Pension Plans [Member]
    
Net periodic benefit cost of pension and post retirement benefit plans    
Service cost 137 122
Interest cost 181 184
Expected return on plan assets (180) (156)
Recognized net actuarial loss 10 6
Net periodic benefit cost $ 148 $ 156