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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Loss Carryforwards [Line Items]        
Income tax provision $ 106,256 $ 103,528 $ 82,286  
Actual income tax rates 38.10% 37.40% 35.90%  
Unrecognized income tax benefits $ 4,761 $ 5,203 $ 3,116  
Unrecognized income tax benefits, if recognized, that would favorably affect the effective income tax rate 3,000 3,000    
Accrued interest expense related to unrecognized income tax benefits 400 300    
Interest expense related to unrecognized income tax benefits recognized 100 100    
Reversal of accrued interest expense related to unrecognized income tax benefits 100 100    
Unrecognized income tax benefits to be recognized in the next twelve months 4,100      
Net deferred income tax asset 120,627 112,183    
Valuation allowance for deferred tax assets 805 2,024    
Cash and cash equivalents 486,831 432,056 $ 439,813 $ 605,303
Other Long-Term Liabilities        
Operating Loss Carryforwards [Line Items]        
Income tax reserve 5,200 5,500    
Prepaid Expenses and Other        
Operating Loss Carryforwards [Line Items]        
Net deferred income tax asset 36,000 29,300    
Other Assets        
Operating Loss Carryforwards [Line Items]        
Net deferred income tax asset 11,300 16,600    
Other Long-Term Obligations        
Operating Loss Carryforwards [Line Items]        
Net deferred income tax asset 167,900 $ 173,700    
United Kingdom Subsidiary        
Operating Loss Carryforwards [Line Items]        
Trading and capital losses 23,400      
Undistributed foreign earnings 21,900      
Cash and cash equivalents 46,500      
Puerto Rico Subsidiary        
Operating Loss Carryforwards [Line Items]        
Undistributed foreign earnings 1,400      
Cash and cash equivalents 3,000      
Income tax expense from repatriation of foreign cash held $ 500