Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash, Cash Equivalents and Restricted Cash as of:
Cash and cash equivalents	$ 64,616	$ 16,895	$ 17,258
Restricted cash	192	9,579	143
Total cash, cash equivalents, and restricted cash at the end of the period	$ 64,808	$ 26,474	$ 17,401	$ 30,035