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Level 4 Stockholders' Equity (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2013
Underwriting discounts and commissions [Member]
Jun. 30, 2013
Other offering expenses [Member]
Feb. 11, 2013
Subsequent Event [Member]
Jul. 30, 2013
Subsequent Event [Member]
Equity [Abstract]                      
Shares of common stock issued in IPO     13,529,412             13,529,412  
Net proceeds from issuance of common stock     $ 262,599,000 $ 0           $ 263,000,000  
Stock issuance costs               19,200,000 2,300,000    
Common stock, authorized 300,000,000   300,000,000   300,000,000 300,000,000          
Preferred stock, authorized 50,000,000   50,000,000   50,000,000 50,000,000          
Common stock, outstanding 43,229,412   43,229,412   29,700,000 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) (120,845,000) (40,195,000)          
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] (384,000) (80,650,000) (3,293,000)        
Ending Balance (118,395,000) (116,778,000) (118,395,000) (116,778,000) (121,229,000) (120,845,000) (40,195,000)        
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 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.