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Retirement Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Employer's matching contribution for every dollar the employees contribute (as a percent) 50.00%      
Employer's matching contribution, vesting period (in years) 5 years      
Aggregate employer's contribution to pension plans $ 2.5 $ 1.9 $ 2.3  
Assets under the plan       $ 1.6
Benefit obligations under the plan       2.0
Pension liability       $ 0.4
Maximum        
Employer's contribution as a percentage of employee's eligible compensation 3.00%      
Employer's contribution as a percentage of the maximum an employee is permitted to contribute under IRS limits 3.00%