CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Cash Flows [Abstract]
Cash and cash equivalents	$ 39,344	$ 47,707
Restricted cash	12,517	24,021
Cash paid for capitalized interest	$ 1,492	$ 5,009