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Litigation, Claims, Contingencies and Other (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Loss Contingencies [Line Items]    
Environment remediation liability included in other current liabilities $ 499,000 $ 571,000
Environment remediation liability included in other deferred items and liabilities 4,762,000 4,745,000
Litigation Claims Contingencies and Other (Textual) [Abstract]    
Environmental remediation liability 5,300,000  
Maximum potential amount of future payments 19,000,000  
Guarantees relate to leased facilities expiry date October 2017  
Recourse provision to recover guarantees 0  
Original new contract possible term 25 years  
Concession Contact expiration date range start Dec. 31, 2005  
Extended period of concession contract 8 years  
Contract extension time period 1 year  
Concession contract expiration date range end Dec. 31, 2013  
Revenue through concession contract 49.00%  
Concession contract period   16 years
Concession contract beginning date   Jan. 01, 2014
Possessory interest 25,000,000  
Operating lease term 42 years  
Ground lease end date Jan. 31, 2052  
Segment operating income 24.00%  
Maximum [Member]
    
Loss Contingencies [Line Items]    
Estimated amount for personal property 6,000,000  
Minimum [Member]
    
Loss Contingencies [Line Items]    
Estimated amount for personal property 5,000,000  
Other current liabilities [Member]
    
Loss Contingencies [Line Items]    
Environment remediation liability included in other current liabilities 499,000  
Other deferred items and liabilities [Member]
    
Loss Contingencies [Line Items]    
Environment remediation liability included in other deferred items and liabilities $ 4,800,000