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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Benefit Plan [Abstract]      
Maximum compensation deferred subject to limitations (in hundredths) 100.00%    
Deferred compensation arrangement with individual, description Employees age 18 and older are eligible to contribute to the plan starting the first day of employment    
Requisite service period After completing at least one day of service, employees are eligible to receive matching contributions from the Company    
Employer matched employees' base pay (in hundredths) 4.00% 4.00% 4.00%
Company's contribution evenly vest (in years) 4 years    
Company's contributions cliff vest (in years) 2 years    
Compensation expense $ 2.7 $ 2.4 $ 2.3
Additional deferred compensation arrangement, percentage of employees pay, maximum (in hundredths) 10.00%    
Additional deferred compensation contribution 6.1 3.5 2.1
Accrued pension liability 6.2 7.6 8.4
Pension expense $ 0.8 $ 1.1 $ 0.9
Vesting period 5 years    
Vesting period expressed as a percentage per year (in hundredths) 20.00%