Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value of Financial Instruments [Abstract]

Carrying Amounts of Financial Instruments

	As of December 31, 2017				As of December 31, 2016
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Cash and cash equivalents	$	197,337	$	197,337	$	144,122	$	144,122
Restricted cash		46,012		46,012		46,106		46,106
Notes receivable, net		431,801		525,000		430,480		545,000
Lines-of-credit, notes payable, and receivable-
backed notes payable		521,312		529,400		513,371		520,600
Junior subordinated debentures		70,384		88,500		69,044		90,000