CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Statement Of Cash Flows [Abstract]
Cash and cash equivalents, beginning balance	$ 21,268	$ 74,823
Cash and cash equivalents, ending balance	33,749	17,330
Restricted cash, beginning balance	13,580	10,846
Restricted cash, ending balance	12,418	13,756
Cash paid for capitalized interest	$ 5,326	$ 2,836