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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 12 Months Ended
Jul. 30, 2013
Feb. 11, 2013
Feb. 04, 2013
Feb. 24, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Feb. 25, 2015
Common stock, authorized         300,000,000 300,000,000    
Preferred stock, authorized         50,000,000 50,000,000    
Preferred Stock, issued         0 0    
Preferred Stock, outstanding         0 0    
Common stock, issued         43,412,660 43,282,201    
Common stock, outstanding         38,825,687 39,418,139    
Net proceeds from issuance of common stock         $ 0 $ 0 $ 262,488  
Reclassification of accumulated deficit to additional paid-in capital upon conversion from an LLC to a C Corporation             0  
Stock repurchase program, number of shares authorized for repurchase               2,000,000
Treasury stock, acquired         23,711   100,000  
Accumulated Other Comprehensive Income (Loss) [Abstract]                
Beginning Balance, net of taxes     $ (121,229) $ (93,015) (101,498) (55,249) (121,229)  
Net actuarial gain (loss), current-period changes, before taxes         8,406 (75,016) 97,171  
Amortization of actuarial loss, amounts reclassified from accumulated other comprehensive loss, before taxes [1]         4,884 (23) 9,202  
Effects of settlements, amounts reclassified from accumulated other comprehensive loss, before taxes [1]         501 0 0  
Amortization of prior service costs and other, amounts reclassified from accumulated other comprehensive loss, before taxes [1]         0 0 304  
Income taxes         (5,308) 28,790 (40,697)  
Ending Balance, net of taxes         $ (93,015) $ (101,498) (55,249)  
Retained Earnings (Accumulated Deficit) [Member]                
Reclassification of accumulated deficit to additional paid-in capital upon conversion from an LLC to a C Corporation     32,000       32,000  
Additional Paid-in Capital [Member]                
Reclassification of accumulated deficit to additional paid-in capital upon conversion from an LLC to a C Corporation     $ (32,000)       $ (32,000)  
Treasury Stock [Member]                
Treasury stock, shares acquired         722,911.000   3,864,000  
Treasury stock, acquired         $ 23,711   $ 100,000  
Treasury stock acquired, average cost per share         $ 32.80      
Treasury Stock [Member] | Subsequent Event [Member]                
Treasury stock, shares acquired       180,100        
Treasury stock, acquired       $ 2,600        
Treasury stock acquired, average cost per share       $ 14.62        
Majority Shareholder [Member]                
Treasury stock, acquired $ 100,000              
Treasury stock, shares acquired 3,864,062              
IPO [Member]                
Shares of common stock issued in IPO   13,529,412            
Net proceeds from issuance of common stock   $ 262,500            
Payments of Underwriting Discounts And Commissions   19,200            
Offering expenses   $ 2,500            
[1] Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 7, Retirement and Benefit Plans.