Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Leased Assets [Line Items]      
Operating Leases, Rent Expense $ 5,800,000 $ 6,100,000 $ 5,300,000
Operating Leases, Future Minimum Payments Due, Current 5,329,000    
Operating Leases, Future Minimum Payments, Due in Two Years 4,943,000    
Operating Leases, Future Minimum Payments, Due in Three Years 4,671,000    
Operating Leases, Future Minimum Payments, Due in Four Years 4,566,000    
Operating Leases, Future Minimum Payments, Due in Five Years 4,553,000    
Operating Leases, Future Minimum Payments, Due Thereafter 264,796,000    
Operating Leases, Future Minimum Payments Due 288,858,000    
Construction Commitments $ 14,300,000