Other Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Promissory note	$ 16,900
Promissory notes maturity period	15 years
Retained interest investments	$ 11,250	$ 11,147
Accounts receivable, net	$ 11,224	8,460
Minimum
Schedule of Investments [Line Items]
Notes maturity year	2022
Maximum
Schedule of Investments [Line Items]
Notes maturity year	2024
Carrying Value \| Level 3
Schedule of Investments [Line Items]
Retained interest investments	$ 11,300	$ 11,100
Homebuilder Homesite Sales, Lot Residuals, Marketing Fees And Tap And Impact Fee Credits
Schedule of Investments [Line Items]
Accounts receivable, net	$ 2,800

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