Net Investments in Properties and Real Estate Under Construction - Rollforward of Real Estate Under Construction (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Real Estate Under Construction    
Beginning balance $ 1,068  
Ending balance 0 $ 1,068
Real estate under construction    
Real Estate Under Construction    
Beginning balance 1,068 110,983
Placed into service (23,819) (130,704)
Capitalized funds 22,762 20,064
Capitalized interest 0 2,200
Foreign currency translation adjustments (11) (1,475)
Ending balance $ 0 $ 1,068