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Commitments and Contingencies - Noncontrolling Interest Holder Put Agreements and Company Call Arrangements (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Redeemable Noncontrolling Interest [Line Items]  
Accretion of redeemable noncontrolling interests and equity $ 12,406
Puttable Non-controlling Interest  
Redeemable Noncontrolling Interest [Line Items]  
Total redeemable noncontrolling interests and equity 11,258
Total noncontrolling interest holder put arrangements $ 11,258