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Litigation, Claims, Contingencies and Other (Details) (USD $)
 9 Months Ended 1 Months Ended
Sep. 30, 2014
Agreement
Sep. 30, 2013
Jan. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Minimum
Sep. 30, 2014
Maximum
Sep. 30, 2014
Glacier Park
Loss Contingencies [Line Items]              
Environmental remediation liability $ 4,900,000            
Maximum potential amount of future payments 7,900,000            
Guarantees relate to leased facilities expiry date October 2017            
Recourse provision to recover guarantees 0            
Bargaining agreements 100            
Self Insurance Reserve 21,400,000            
Workers' Compensation Liability 12,800,000            
Self Insurance Reserve, Employee Health Benefits 1,200,000            
Self Insurance Reserve, General and Auto Insurance 7,400,000            
Self Insurance Reserve, Discontinued Operations 4,800,000            
Insurance Liability, Per Claim, General Range         200,000 400,000  
Payments for Self Insurance Reserves, Net 3,500,000            
Liability in Excess of Self Insurance Levels 5,000,000            
Liability in Excess of Self Insurance Levels, Workers Compensation 1,700,000            
Liability in Excess of Self Insurance Levels, General Liability 3,300,000            
Revenue through concession contract       47.00%      
Possessory interest     25,000,000        
Proceeds from Sale of Property, Plant, and Equipment $ 28,000,000 $ 0         $ 3,000,000