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Commitments and Contingencies (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2013
item
Dec. 31, 2012
Dec. 31, 2011
Leases with purchase options, annualized base rent receivables in next five years and thereafter      
Leases with purchase option, annualized base rent receivables in 2014 $ 21,541,000    
Leases with purchase option, annualized base rent receivables in 2015 55,397,000    
Leases with purchase option, annualized base rent receivables in 2016 40,098,000    
Leases with purchase option, annualized base rent receivables in 2017 6,969,000    
Leases with purchase option, annualized base rent receivables in 2018 19,204,000    
Leases with purchase option, annualized base rent receivables thereafter 102,367,000    
Total leases with purchase option, annualized base rent receivables 245,576,000    
Number of properties with purchase options, annualized base rent receivables      
Number of properties with a purchase option, annualized base rent receivables in 2014 11    
Number of properties with a purchase option, annualized base rent receivables in 2015 35    
Number of properties with a purchase option, annualized base rent receivables in 2016 18    
Number of properties with a purchase option, annualized base rent receivables in 2017 3    
Number of properties with a purchase option, annualized base rent receivables in 2018 5    
Number of properties with a purchase option, annualized base rent receivables thereafter 62    
Total number of properties with a purchase option, annualized base rent receivables 134    
Rental Expense      
Rental expense attributable to continuing operations 8,000,000 7,000,000 6,000,000
Maximum remaining term of ground leases excluding extension options 99 years    
Future minimum lease obligations under non-cancelable ground and other operating leases      
Future minimum lease obligations under non-cancelable ground and other operating leases, 2014 6,303,000    
Future minimum lease obligations under non-cancelable ground and other operating leases, 2015 5,781,000    
Future minimum lease obligations under non-cancelable ground and other operating leases, 2016 4,620,000    
Future minimum lease obligations under non-cancelable ground and other operating leases, 2017 3,880,000    
Future minimum lease obligations under non-cancelable ground and other operating leases, 2018 3,659,000    
Future minimum lease obligations under non-cancelable ground and other operating leases, Thereafter 195,883,000    
Future minimum lease obligations under non-cancelable ground and other operating leases, Total $ 220,126,000