Contracts and Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Contracts Receivable:
Costs incurred on fee building projects	$ 184,827	$ 178,103
Estimated earnings	5,497	8,404
Contracts receivable, before collections	190,324	186,507
Less: amounts collected during the period	(178,704)	(162,203)
Total contracts receivable	11,620	24,304
Billed	0	0
Unbilled	11,620	24,304
Other receivables
Escrow receivables	11,554	3,385
Other receivables	50	144
Contract and Accounts Receivable	23,224	27,833
Accounts payable related to costs incurred under fee building contracts	$ 11,300	$ 22,800