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Self Administration Transaction - Proforma Operating Information (Details) - GRECO
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
Business Acquisition [Line Items]  
Revenue $ 166,390
Net income 32,989
Net income attributable to noncontrolling interests 5,001
Net income attributable to common stockholders $ 27,812
Net income to common stockholders per share, basic and diluted (in usd per share) | $ / shares $ 0.16