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Level 4 Stockholders' Equity (Details) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Underwriting discounts and commissions [Member]
Jun. 30, 2013
Other offering expenses [Member]
Jul. 30, 2013
Subsequent Event [Member]
Equity [Abstract]                
Shares of common stock issued in IPO     13,529,412          
Net proceeds from issuance of common stock     $ 262,599,000 $ 0        
Stock issuance costs           19,200,000 2,300,000  
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 43,229,412   43,229,412   29,700,000     39,365,350
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 (119,820,000) (118,778,000) (121,229,000) (120,845,000)        
Defined benefit plans, amounts reclassified from accumulated other comprehensive loss, net of tax 1,425,000 [1] 2,000,000 [1] 2,834,000 [1] 4,067,000 [1]        
Ending Balance (118,395,000) (116,778,000) (118,395,000) (116,778,000)        
Other comprehensive income, reclassification adjustment from AOCI, pension plans, tax $ 878,000 $ 0 $ 1,748,000 $ 0        
Subsequent Events [Abstract]                
Common Stock, Shares, Issued               43,229,412
Common stock, outstanding after secondary offering and repurchase 43,229,412   43,229,412   29,700,000     39,365,350
[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 6, Retirement and Benefit Plans.