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Employee Benefit Plans (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
participant
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Defined contribution plan      
Employer contribution to the plan | $ $ 2.1 $ 1.9 $ 1.9
Pension Plan      
Employee benefit plans      
Minimum age for eligibility under the Pension Plan | item 21    
Minimum period of service for eligibility under the Pension Plan 5 years    
Normal retirement benefit (as a percent) 2.00%    
Number of highest consecutive years' average earnings used in computing retirement benefit 5 years    
Maximum number of years of credited service considered in determining retirement benefit 40 years    
Number of participants in the Pension Plan | participant 969    
Pension Plan      
Defined contribution plan      
Percentage of participant's eligible pay contributed to the plan by the employer 5.25%    
Eligibility for employer matching contributions, period of service 3 years