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Noncontrolling Interest - LTIP Units Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2016
USD ($)
shares
Dec. 31, 2016
shares
Other Common Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unit conversion ratio     1    
General and Administrative Expenses          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation $ 2,388 $ 2,044 $ 4,775 $ 5,649  
LTIP Units | General and Administrative Expenses          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation $ 1,171 $ 1,098 $ 2,341 $ 3,893  
2011 Equity Incentive Plan | LTIP Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | shares 45,204 45,874 112,874 216,151 307,883
Unrecognized compensation costs $ 7,100   $ 7,100    
Unrecognized compensation costs, period for recognition     2 years 6 months 29 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 1,248 $ 1,092 $ 2,911 $ 4,181  
2011 Equity Incentive Plan | LTIP Units | Geoffrey G. Jervis | General and Administrative Expenses          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation       $ 1,600  
Grant Date January 8, 2016 | Awards vest over five years | 2011 Equity Incentive Plan | LTIP Units | Executive officers          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years)     4 years