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Future Minimum Base Rents and Future Minimum Lease Payments - Future Minimum Base Rents (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Leases, Future Minimum Payments Receivable [Abstract]      
2016 $ 457,572    
2017 394,496    
2018 328,221    
2019 280,505    
2020 191,866    
Thereafter 659,595    
Total 2,312,255    
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Minimum rent expense 9,200 $ 1,400 $ 1,400
Non-Cancelable Leases      
Operating Leases, Future Minimum Payments Receivable [Abstract]      
2016 454,744    
2017 386,814    
2018 302,046    
2019 252,028    
2020 184,297    
Thereafter 634,613    
Total 2,214,542    
Subject to Early Termination Options      
Operating Leases, Future Minimum Payments Receivable [Abstract]      
2016 2,828    
2017 7,682    
2018 26,175    
2019 28,477    
2020 7,569    
Thereafter 24,982    
Total 97,713    
Ground Lease      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2016 [1],[2],[3] 12,085    
2017 [1],[2],[3] 12,208    
2018 [1],[2],[3] 14,070    
2019 [1],[2],[3] 14,120    
2020 [1],[2],[3] 14,120    
Thereafter [1],[2],[3] 413,927    
Total [1],[2],[3] 480,530    
Corporate Office Operating Leases      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2016 1,662    
2017 2,072    
2018 2,134    
2019 2,198    
2020 2,264    
Thereafter $ 11,487    
[1] In situations where ground lease obligation adjustments are based on CPI adjustment, the future minimum lease amounts above include the lease rentalobligations in affect as of December 31, 2015.
[2] In situations where ground lease obligation adjustments are based on the percentages of gross income that exceeds the minimum annual rent, the futureminimum lease amounts above include the lease rental obligations in affect as of December 31, 2015.
[3] In situations where ground lease obligation adjustments are based on third-party appraisals of fair market land value, the future minimum lease amountsabove include the lease rental obligations in affect as of December 31, 2015.