SCHEDULE II - Condensed Financial Information of Registrant (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Other income									$ 10,646	$ 14,424	$ 17,386
Total revenues	$ 241,150	$ 231,474	$ 220,374	$ 214,127	$ 214,522	$ 224,692	$ 228,041	$ 218,344	907,125	885,599	817,625
Expenses:
Other operating expenses									170,908	201,035	196,993
Other expenses									1,055	1,300	539
Interest expense									10,596	11,553	8,974
Total expenses									855,258	814,761	762,480
Loss before equity in net income of subsidiaries									51,867	70,838	55,145
Equity in net income of subsidiaries									4,598	3,540	13,209
Net income	20,471	(25,167)	20,307	22,728	11,632	19,581	16,984	15,633	38,339	63,830	43,566
Other comprehensive (loss) income:
Equity in other comprehensive earnings (losses) of subsidiaries									46,942	(22,203)	9,219
Total comprehensive income	$ 16,964	$ (15,710)	$ 41,039	$ 42,988	$ 18,923	$ 15,192	$ 10,426	$ (2,914)	85,281	41,627	52,785
Parent Company
Revenues:
Other income									61	58	49
Total revenues									61	58	49
Expenses:
Other operating expenses									14,267	13,768	10,375
Other expenses									0	337	640
Interest expense									5,047	5,122	4,130
Total expenses									19,314	19,227	15,145
Loss before equity in net income of subsidiaries									(19,253)	(19,169)	(15,096)
Equity in net income of subsidiaries									57,592	82,999	58,662
Net income									38,339	63,830	43,566
Other comprehensive (loss) income:
Equity in other comprehensive earnings (losses) of subsidiaries									46,942	(22,203)	9,219
Total comprehensive income									$ 85,281	$ 41,627	$ 52,785