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, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Commitments [Line Items]      
Rent expense $ 5,800,000 $ 5,800,000 $ 6,100,000
2014 5,602,000    
2015 5,234,000    
2016 5,015,000    
2017 4,875,000    
2018 4,850,000    
Thereafter 280,983,000    
Operating leases, future minimum payments due 306,559,000    
Construction commitments 85,800,000    
Partnership Interest [Member]
     
Other Commitments [Line Items]      
Construction commitments $ 46,600,000