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Pension Plans (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components of net periodic benefit obligation      
Projected benefit obligation at beginning of the year $ 30,863 $ 23,665  
Service cost 1,300 1,003 813
Interest cost 1,411 1,373 1,195
Actuarial loss 4,859 5,364  
Gain on curtailment (6,275) 0  
Benefits paid (568) (542)  
Projected benefit obligation at end of year 31,590 30,863 23,665
Components of net periodic benefit cost in fair value      
Fair value of plan assets at beginning of the year 15,077 14,192  
Actual return on plan assets 1,748 297  
Employer contributions 2,149 1,130  
Benefits paid (568) (542)  
Fair value of plan assets at end of the year 18,406 15,077 14,192
Unfunded pension obligation $ 13,184 $ 15,786