CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
Balance at Dec. 31, 2017	$ 1,071	$ 382,014	$ 565,504	$ (1,404)	$ (375,857)	$ 571,328
Net earnings (loss)			(1,814)			(1,814)
Adoption of accounting standards			90			90
Other comprehensive income, net				438		438
Adjustment to treasury stock for holdings in investment partnerships					(18,377)	(18,377)
Exercise of stock options		(39)			81	42
Balance at Mar. 31, 2018	1,071	381,975	563,780	(966)	(394,153)	551,707
Balance at Dec. 31, 2017	1,071	382,014	565,504	(1,404)	(375,857)	571,328
Net earnings (loss)						(9,353)
Other comprehensive income, net						(703)
Balance at Jun. 30, 2018	1,138	381,904	535,415	(2,107)	(373,620)	542,730
Balance at Mar. 31, 2018	1,071	381,975	563,780	(966)	(394,153)	551,707
Net earnings (loss)			(7,539)			(7,539)
Other comprehensive income, net				(1,141)		(1,141)
Conversion of common stock	67	(67)	(20,826)		20,826	0
Adjustment to treasury stock for holdings in investment partnerships					(304)	(304)
Exercise of stock options		(4)			11	7
Balance at Jun. 30, 2018	1,138	381,904	535,415	(2,107)	(373,620)	542,730
Balance at Dec. 31, 2018	1,138	381,904	564,160	(2,516)	(374,231)	570,455
Net earnings (loss)			9,818			9,818
Adoption of accounting standards			1,499			1,499
Other comprehensive income, net				(304)		(304)
Adjustment to treasury stock for holdings in investment partnerships					(114)	(114)
Balance at Mar. 31, 2019	1,138	381,904	575,477	(2,820)	(374,345)	581,354
Balance at Dec. 31, 2018	1,138	381,904	564,160	(2,516)	(374,231)	570,455
Net earnings (loss)						31,792
Other comprehensive income, net						(108)
Balance at Jun. 30, 2019	1,138	381,904	597,451	(2,624)	(375,507)	602,362
Balance at Mar. 31, 2019	1,138	381,904	575,477	(2,820)	(374,345)	581,354
Net earnings (loss)			21,974			21,974
Other comprehensive income, net				196		196
Adjustment to treasury stock for holdings in investment partnerships					(1,162)	(1,162)
Balance at Jun. 30, 2019	$ 1,138	$ 381,904	$ 597,451	$ (2,624)	$ (375,507)	$ 602,362