Schedule II - Condensed Financial Information of Registrant - Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue
Revenue									$ 98,911	$ 96,837	$ 93,883
Other income	$ 370	$ 405	$ 450	$ 357	$ 357	$ 477	$ 372	$ 354	1,582	1,560	1,118
Expenses
Operating expenses	4,407	4,786	4,303	4,187	3,993	4,474	4,370	4,530	17,683	17,367	17,596
Interest expense	810	598	617	619	616	303	219	224	2,644	1,362	647
Total expenses									108,376	118,891	102,526
Income tax expense (benefit)	0	24	10	18	(36)	(135)	(282)	6	52	(447)	(77)
Net income (loss)	$ (4,776)	$ (3,551)	$ (1,113)	$ 213	$ 221	$ (18,898)	$ (1,067)	$ (1,798)	(9,227)	(21,542)	(8,437)
Other Comprehensive Income
Equity in other comprehensive income (loss) of subsidiaries									(1,770)	717	(1,262)
Total comprehensive income (loss)									(10,997)	(20,825)	(9,699)
Parent Company
Revenue
Revenue									13,640	16,731	9,962
Other income									73	826	51
Expenses
Operating expenses									17,336	13,496	16,995
Interest expense									2,644	1,362	647
Total expenses									19,980	14,858	17,642
Income (loss) before equity in earnings (losses) of subsidiaries and income tax expense (benefit)									(6,340)	1,873	(7,680)
Income tax expense (benefit)									(581)	859	(864)
Income (loss) before equity earnings (losses) of subsidiaries									(5,759)	1,014	(6,816)
Equity earnings (losses) in subsidiaries									(3,468)	(22,556)	(1,621)
Net income (loss)									(9,227)	(21,542)	(8,437)
Other Comprehensive Income
Equity in other comprehensive income (loss) of subsidiaries									(1,770)	717	(1,262)
Total comprehensive income (loss)									(10,997)	(20,825)	(9,699)
Management fees from subsidiaries | Parent Company
Revenue
Revenue									$ 13,567	$ 15,905	$ 9,911