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Level 4 Income Taxes (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 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
Capital loss carryforwards, valuation allowance 6,100,000      
Blended statutory federal and state income tax rate 38.00%      
Income Tax Rate Reconciliation [Abstract]        
Income before income taxes 19,729,000 1,729,000    
Statutory U.S. income tax rate 35.00%      
Statutory tax provision 6,905,000      
State taxes 625,000      
Other 29,000      
Total (61,107,000) 61,000    
Effective income tax rate excluding discrete item (309.70%)   1.00%  
Recognition of beginning deferred tax balances (68,666,000)      
Income tax benefit with discrete item (61,107,000) 61,000    
Effective income tax rate with discrete item (309.70%)   1.00%  
Current income tax provision (benefit) [Abstract]        
Federal 5,948,000      
State 963,000      
Foreign 0      
Total current 6,911,000      
Deferred income tax provision (benefit) [Abstract]        
Federal (62,348,000)      
State (5,670,000)      
Foreign 0      
Total deferred (68,018,000) 0    
Income tax benefit with discrete item (61,107,000) 61,000    
Income tax expense, excluding discrete items [Member]
        
Income Tax Rate Reconciliation [Abstract]        
Total 7,559,000      
Effective income tax rate excluding discrete item 38.30%      
Income tax benefit with discrete item 7,559,000      
Effective income tax rate with discrete item 38.30%      
Deferred income tax provision (benefit) [Abstract]        
Income tax benefit with discrete item $ 7,559,000