Schedule I - Condensed Financial Information of the Parent (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating Activities
Net cash provided by (used for) operating activities	$ 74,875	$ (2,486)
Investing Activities
Net cash used for investing activities	(44,147)	(45,984)
Financing Activities
Purchase of treasury shares	0	(1,002)
Cash dividends paid	(5,617)	(5,375)
Net cash (used for) provided by financing activities	(33,173)	14,028
Cash and Cash Equivalents
Total decrease for the year	(2,445)	(34,442)
Balance at the beginning of the year	88,450	122,892
Balance at the end of the year	86,005	88,450
Parent Company
Operating Activities
Net income	48,125	14,793
Equity in earnings of subsidiaries	52,798	23,045
Net loss before equity in earnings of subsidiaries	(4,673)	(8,252)
Net changes related to operating activities	8,018	(22,822)
Net cash provided by (used for) operating activities	3,345	(31,074)
Investing Activities
Net cash used for investing activities	0	0
Financing Activities
Dividends received from subsidiaries	0	3,000
Notes payable to Bellaire	0	(200)
Purchase of treasury shares	0	(1,002)
Cash dividends paid	(5,617)	(5,375)
Net cash (used for) provided by financing activities	(5,617)	(3,577)
Cash and Cash Equivalents
Total decrease for the year	(2,272)	(34,651)
Balance at the beginning of the year	85,365	120,016
Balance at the end of the year	$ 83,093	$ 85,365