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Retirement Plans (Details) (USD $)
12 Months Ended
Dec. 31, 2013
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Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
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Retirement Plans        
Employer's matching contribution for every dollar the employees contribute (as a percent) 50.00% 50.00% 50.00%  
Employer's matching contribution, maximum $ 7,650 $ 7,500 $ 3,000  
Employer's contribution as a percentage of employee's eligible compensation, maximum 3.00% 3.00%    
Employer's matching contribution, vesting period (in years) 5 years      
Number of foreign subsidiaries 1      
Aggregate employer's contribution to pension plans 2,300,000 2,500,000 2,100,000  
Number of participants       110
Contract assets under the plan       $ 1,600,000