CONSOLIDATED STATEMENTS OF CASH FLOWS - (Restricted cash and investments) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Reconciliation of Cash and cash equivalents and restricted cash
Cash and cash equivalents at beginning of period	$ 27,042	$ 9,244	$ 7,015
Restricted cash at beginning of period	1,757	1,734	1,707
Cash and cash equivalents and restricted cash at beginning of period	28,799	10,978	8,722
Cash and cash equivalents at end of period	26,076	27,042	9,244
Restricted cash at end of period	763	1,757	1,734
Cash and cash equivalents and restricted cash at end of period	$ 26,839	$ 28,799	$ 10,978