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Level 4 Stockholders' Equity (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Equity [Abstract]          
Shares of common stock issued in IPO     13,529,412    
Net proceeds from issuance of common stock     $ 262,488,000 $ 0  
Common Stock, Shares, Issued 43,229,412   43,229,412   29,700,000
Treasury Stock, Shares, Acquired     3,864,062    
Treasury Stock, Value, Acquired, Cost Method     100,000,000    
Common stock, authorized 300,000,000   300,000,000   300,000,000
Preferred stock, authorized 50,000,000   50,000,000   50,000,000
Common stock, outstanding 39,365,350   39,365,350   29,700,000
Reclassification of accumulated deficit to additional paid-in capital upon conversion from an LLC to a C Corporation     32,000,000    
Accumulated Other Comprehensive Loss [Abstract]          
Beginning Balance (118,395,000) (116,778,000) (121,229,000) (120,845,000)  
Defined benefit plans, amounts reclassified from accumulated other comprehensive loss, net of tax 1,457,000 [1] 1,865,000 [1] 4,291,000 [1] 5,932,000 [1]  
Ending Balance (116,938,000) (114,913,000) (116,938,000) (114,913,000)  
Other comprehensive income, reclassification adjustment from AOCI, pension plans, tax 899,000 0 2,647,000 0  
Underwriting discounts and commissions [Member]
          
Equity [Abstract]          
Stock issuance costs     19,200,000    
Other offering expenses [Member]
          
Equity [Abstract]          
Stock issuance costs     $ 2,500,000    
Secondary public offering [Member]
          
Equity [Abstract]          
Registered Shares of Common Stock 10,000,000        
[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 8, Retirement and Benefit Plans.