CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement of Cash Flows [Abstract]
Cash and cash equivalents	$ 17,330	$ 43,442
Restricted cash	13,756	24,311
Cash paid for capitalized interest	$ 2,836	$ 9,666