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Fair Value Measures - Schedule of assets measured at fair value on a recurring basis (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Assets:    
Derivative assets   $ 544
Investment in Cole REITs $ 7,552 7,844
Total assets   8,388
Derivative liabilities (27,594)  
Level 1 [Member]    
Assets:    
Derivative assets   0
Investment in Cole REITs 0 0
Total assets   0
Derivative liabilities 0  
Level 2 [Member]    
Assets:    
Derivative assets   544
Investment in Cole REITs 0 0
Total assets   544
Derivative liabilities (27,594)  
Level 3 [Member]    
Assets:    
Derivative assets   0
Investment in Cole REITs 7,552 7,844
Total assets   $ 7,844
Derivative liabilities $ 0