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Redeemable Noncontrolling Interests (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]  
Redeemable noncontrolling interest, beginning balance $ 15,696
Net income attributable to noncontrolling interests 302
Redeemable noncontrolling interest, ending balance 15,998
Redeemable noncontrolling interests $ 12,200