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Redeemable Noncontrolling Interests	12 Months Ended
Redeemable Noncontrolling Interests	Dec. 31, 2018
Noncontrolling Interest [Abstract]
Redeemable Noncontrolling Interests	Redeemable Noncontrolling Interests During certain specified periods of time (the “Early Exit Periods”), noncontrolling interests in certain funding arrangements have the right to put all of their membership interests to the Company (the “Put Provisions”). During a specific period of time (the “Call Periods”), the Company has the right to call all membership units of the related redeemable noncontrolling interests. The carrying value of redeemable noncontrolling interests was greater than the redemption value except for six Funds at both December 31, 2018 and 2017, where the carrying value has been adjusted to the redemption value.