Annual report pursuant to Section 13 and 15(d)

Accounting Policies Other Comprehensive Income (Loss) (Details)

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Accounting Policies Other Comprehensive Income (Loss) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Deferred financing costs amortization $ 2,300,000 $ 2,400,000 $ 3,100,000
Deferred leasing costs amortization 4,600,000 4,400,000 4,000,000
Deferred leasing incentives amortization 700,000 200,000 100,000
Real estate depreciation 71,200,000 64,800,000 62,300,000
Capitalized interest 700,000 900,000 1,400,000
Accumulated other comprehensive income (loss) 0 (1,469,000)  
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (1,469,000) (288,000) (578,000)
Gross Carrying Value Deferred Leasing Incentives [Member]
     
Incentive to Lessee, Gross Carrying Value 4,800,000 2,600,000  
Accumulated Amortization Deferred Leasing Incentives [Member]
     
Incentive to Lessee, Accumulated Amortization 1,000,000 400,000  
Net Deferred Leasing Incentives [Member]
     
Incentive to Lessee $ 3,800,000 $ 2,200,000