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Level 4 Stockholders' Equity (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Equity [Abstract]      
Shares of common stock issued in IPO 13,529,412    
Net proceeds from issuance of common stock $ 262,736,000 $ 0  
Common stock, authorized 300,000,000   300,000,000
Preferred stock, authorized 50,000,000   50,000,000
Common stock, outstanding 43,229,412   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]      
Balance at December 31 (121,229,000) (120,845,000)  
Defined benefit plans, amounts reclassified from accumulated other comprehensive loss, net of tax 1,409,000 [1] 2,067,000 [1]  
Balance at March 31 (119,820,000) (118,778,000)  
Defined benefit pension plans, amounts reclassified from accumulated other comprehensive loss, tax effect 870,000 0  
Underwriting discounts and commissions [Member]
      
Equity [Abstract]      
Stock issuance costs 19,200,000    
Other offering expenses [Member]
      
Equity [Abstract]      
Stock issuance costs $ 2,200,000    
[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 6, Retirement and Benefit Plans.