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, 2015	$ 1,071	$ 391,853	$ 415,982	$ (3,679)	$ (353,855)	$ 451,372
Net earnings			51,163			51,163
Other comprehensive income, net				75		75
Adjustment to treasury stock for holdings in investment partnerships					(10,930)	(10,930)
Exercise of stock options		(5)			6	1
Balance at Mar. 31, 2016	1,071	391,848	467,145	(3,604)	(364,779)	491,681
Balance at Dec. 31, 2016	1,071	381,906	515,433	(3,584)	(362,886)	531,940
Net earnings			(15,821)			(15,821)
Other comprehensive income, net				309		309
Adjustment to treasury stock for holdings in investment partnerships		116			(1,600)	(1,484)
Exercise of stock options		(8)			38	30
Balance at Mar. 31, 2017	$ 1,071	$ 382,014	$ 499,612	$ (3,275)	$ (364,448)	$ 514,974