SCHEDULE I - CONDENSED FINANCIAL INFORMATION (Details 3) - USD ($) $ in Thousands	5 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Cash flows from financing activities:
Repurchase of stock for treasury	$ (2,397)		$ (1,488)
Payment of withholding taxes related to stock-based compensation to employees	0		(331)
Payment of Dow liabilities settlement	0	(10,000)	0
Net (decrease) increase in cash and cash equivalents	57,681	(12,779)	19,547
Cash and cash equivalents, beginning of period		77,312	57,765
Cash and cash equivalents, end of period	57,765	64,533	77,312
Parent Company
Cash flows from operating activities:
Net cash provided by operating activities		10,000	1,818
Cash flows from investing activities:
Net cash provided by (used in) investing activities		0	0
Cash flows from financing activities:
Repurchase of stock for treasury		0	(1,487)
Payment of withholding taxes related to stock-based compensation to employees		0	(331)
Payment of Dow liabilities settlement		(10,000)	0
Net cash (used in) by financing activities		(10,000)	(1,818)
Net (decrease) increase in cash and cash equivalents		0	0
Cash and cash equivalents, beginning of period		0	0
Cash and cash equivalents, end of period	$ 0	$ 0	$ 0