SCHEDULE I - CONDENSED FINANCIAL INFORMATION (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net cash provided by operating activities	$ 20,059	$ 3,012	$ 35,389
Cash flows from investing activities:
Net cash provided by investing activities	(4,426)	(5,751)	(36,950)
Cash flows from financing activities:
Payment of Dow liabilities settlement	0	(10,000)	(10,000)
Net cash used in financing activities	(22,047)	(22,228)	(14,015)
Net increase (decrease) in cash and equivalents during the period	(5,035)	(29,681)	(12,779)
Cash and cash equivalents, beginning of period	34,852	64,533	77,312
Cash and cash equivalents, end of period	29,817	34,852	64,533
Parent Company
Cash flows from operating activities:
Net cash provided by operating activities	16,003	10,000	10,000
Cash flows from investing activities:
Net cash provided by investing activities	0	0	0
Cash flows from financing activities:
Payment of Dow liabilities settlement	(16,003)	(10,000)	(10,000)
Net cash used in financing activities	(16,003)	(10,000)	(10,000)
Net increase (decrease) in cash and equivalents during the period	0	0	0
Cash and cash equivalents, beginning of period	0	0	0
Cash and cash equivalents, end of period	$ 0	$ 0	$ 0