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Employee Benefit Plan (Details) - Defined Contribution Benefit Plan [Member] - United States Postretirement Benefit Plan of US Entity [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Contribution Plan Disclosure [Line Items]      
Particiapnts' vesting percentage in Company's match when contributions are made (percent) 100.00%    
Contributions made under the Plan $ 5.8 $ 6.0 $ 7.1
Defined Contribution Plan Tranches One [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Employer match contributions (percent) 100.00%    
Employer contribution percentage to defined contribution plan 3.00%    
Defined Contribution Plan Tranches Two [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Employer match contributions (percent) 50.00%    
Employer contribution percentage to defined contribution plan 2.00%