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Acquired Properties - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Property, Plant and Equipment [Abstract]        
Revenues   $ 62,993   $ 131,723
Net income from continuing operations   19,697   35,282
Revenue of acquiree since acquisition $ 5,455 6,589 $ 8,986 6,589
Earnings of acquiree since acquisition $ 3,935 4,897 $ 6,672 4,897
Acquisition and transaction costs   $ 627   $ 770