Commitments and Contingencies (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)	Jun. 02, 2016 USD ($) Guarantee	Nov. 30, 2015 USD ($)	Sep. 04, 2015 USD ($)	Oct. 09, 2012 USD ($)
Loss Contingencies [Line Items]
Bank loan issued to VIE, partially guaranteed by parent				$ 13,300,000	$ 18,000,000
Bank loan issued to VIE, percentage guaranteed by parent (percent)					25.00%
Parent's guarantor obligation, maximum exposure		$ 3,300,000		$ 1,800,000	$ 4,500,000
Termination of limited guarantees, consecutive quarters at a specified debt yield	6 months
Number of guarantees | Guarantee		3
Forgivable Notes Receivable
Loss Contingencies [Line Items]
Other commitment	$ 188,300,000
Commitment due in next twelve months	108,100,000
Capital Contribution to Joint Venture
Loss Contingencies [Line Items]
Commitment due in next twelve months	21,400,000
Development Company
Loss Contingencies [Line Items]
Other commitment			$ 49,100,000
Payments to acquire loans receivable	$ 30,400,000
Variable Interest Entity, Not Primary Beneficiary
Loss Contingencies [Line Items]
Construction Loan		$ 46,200,000
Variable Interest Entity, Not Primary Beneficiary | Medium-term Notes
Loss Contingencies [Line Items]
Debt instrument, face amount		$ 61,000,000