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Real Estate Properties - Intangible Lease Assets and Obligations - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Real Estate [Line Items]    
Acquired Real Estate Leases $ 775,935 $ 779,761
Intangible lease liabilities recorded 137,351 139,346
Accumulated amortization of capitalized below market lease values 31,312 23,819
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2017 64,832  
2018 46,101  
2019 39,599  
2020 37,089  
2021 34,813  
Thereafter $ 185,974  
Weighted Average    
Real Estate [Line Items]    
Remaining amortization period on below market lease assets 11 years 7 months 6 days  
Above market lease    
Real Estate [Line Items]    
Acquired Real Estate Leases $ 43,906 48,048
Accumulated amortization $ 28,739 26,828
Above market lease | Weighted Average    
Real Estate [Line Items]    
Finite-lived intangibles, remaining amortization period 4 years 9 months 18 days  
Original value lease    
Real Estate [Line Items]    
Acquired Real Estate Leases $ 732,029 731,713
Accumulated amortization $ 232,750 $ 148,647
Original value lease | Weighted Average    
Real Estate [Line Items]    
Finite-lived intangibles, remaining amortization period 10 years 4 months 24 days