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Retirement Plans - Defined Contribution Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred Profit Sharing      
Defined Contribution Plan Disclosure [Line Items]      
Defined contribution plan, cost recognized $ 2.8 $ 1.7 $ 4.0
401k Plan      
Defined Contribution Plan Disclosure [Line Items]      
Eligible employee contribution maximum (percentage) 15.00%    
Employment eligibility for plan participation minimum (in days) 90 days    
Defined contribution plan, employment eligibility to receive matching contributions, minimum (in years) 1 year    
Defined contribution plan, percentage of eligible employee contribution match, first tier 100.00%    
Defined contribution plan, percentage of eligible employee contributions matched fully, first tier 3.00%    
Defined contribution plan, eligible employee contribution match, second tier 50.00%    
Defined contribution plan, eligible employee contribution matched by the company, second tier 2.00%    
Defined contribution plan, cost recognized $ 7.3 $ 5.0 $ 1.7