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Level 4 Income Taxes (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Feb. 04, 2013
Income Taxes [Line Items]            
Deferred tax assets, gross           $ 101,900,000
Deferred tax liabilities, gross           33,200,000
Deferred tax assets, pensions           69,800,000
Deferred tax liabilities, property and equipment           27,400,000
Deferred tax assets, other employee benefits           18,000,000
Income Taxes Paid, Net     12,700,000 200,000    
Income Tax Rate Reconciliation [Abstract]            
Income before income taxes 17,209,000 15,125,000 36,938,000 16,854,000    
Statutory U.S. income tax rate 35.00%   35.00%      
Statutory tax provision     12,928,000      
State taxes     1,231,000      
Other     197,000      
Effective income tax rate excluding discrete item     (147.00%)   1.00%  
Recognition of beginning deferred tax balances     (68,666,000)      
Income tax provision (benefit) 6,797,000 78,000 (54,310,000) 139,000    
Current income tax provision (benefit) [Abstract]            
Federal     10,208,000      
State     1,796,000      
Foreign     0      
Total current     12,004,000      
Deferred income tax provision (benefit) [Abstract]            
Federal     (60,745,000)      
State     (5,569,000)      
Foreign     0      
Total deferred     (66,314,000) 0    
Income tax provision (benefit) 6,797,000 78,000 (54,310,000) 139,000    
Income tax expense, excluding discrete items [Member]
            
Income Tax Rate Reconciliation [Abstract]            
Effective income tax rate excluding discrete item 39.50%   38.90%      
Income tax provision (benefit) 6,800,000   14,356,000      
Deferred income tax provision (benefit) [Abstract]            
Income tax provision (benefit) 6,800,000   14,356,000      
Capital loss carryforward [Member]
            
Income Taxes [Line Items]            
Capital loss carryforwards, valuation allowance $ 6,100,000   $ 6,100,000