Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2018	$ 39	$ 121,956	$ 1,880,481	$ (248,308)	$ (42,469)	$ (20,736)	$ 1,690,963
Net loss				(25,533)			(25,533)
Restricted stock units granted			1,579				1,579
Common stock dividends declared				(1,209)			(1,209)
Series B Preferred Stock dividends declared				(138)			(138)
Common stock issued for 401(k) match		96	878				974
Other comprehensive income (loss)					4,259		4,259
Adjustment to fair value of warrants issued for purchase of another company			(325)				(325)
Balance at Mar. 31, 2019	39	122,052	1,882,613	(275,188)	(38,210)	(20,736)	1,670,570
Balance at Dec. 31, 2019	39	132,292	1,973,700	(353,331)	(37,310)	(22,967)	1,692,423
Net loss				(17,185)			(17,185)
Restricted stock units granted			1,219				1,219
Common stock dividends declared				(1,304)			(1,304)
Series B Preferred Stock dividends declared				(138)			(138)
Common stock issued for 401(k) match		89	1,114				1,203
Other comprehensive income (loss)					(19,335)		(19,335)
Balance at Mar. 31, 2020	$ 39	$ 132,381	$ 1,976,033	$ (371,958)	$ (56,645)	$ (22,967)	$ 1,656,883