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Employee Benefit Plans (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Reclassifications related to the SERP from accumulated other comprehensive loss to the statement of operations  
Prior service cost $ 827
Amortization of net actuarial loss 794
Total prior service cost and amortization of net actuarial loss 1,621
Tax benefit (601)
Total, net of tax 1,020
Research and development
 
Reclassifications related to the SERP from accumulated other comprehensive loss to the statement of operations  
Prior service cost 312
Amortization of net actuarial loss 300
Selling, general and administrative
 
Reclassifications related to the SERP from accumulated other comprehensive loss to the statement of operations  
Prior service cost 515
Amortization of net actuarial loss $ 494