Consolidated Statements of Changes in Stockholders' Equity - 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	$ (248,845)	$ (42,469)	$ (20,736)	$ 1,690,426
Net income (loss)	0	0	0	(94,909)	0	0	(94,909)
Adjustment to fair value of warrants issued for purchase of another company	0	0	(325)	0	0	0	(325)
Stock issued to directors	0	63	392	0	0	0	455
Common stock issued for cash, net of offering costs	0	5,353	43,666	0	0	0	49,019
Stock issued for 401(k) match	0	470	3,392	0	0	0	3,862
Restricted stock units granted	0	0	5,213	0	0	0	5,213
Common stock issued for prepayment of debt	0	2,664	30,793	0	0	0	33,457
Common stock and Series B Preferred stock dividends declared	0	0	0	(5,466)	0	0	(5,466)
Common stock issued for employee incentive compensation	0	899	7,375	0	0	(1,595)	6,679
Common stock issued to pension plans	0	596	3,004	0	0	0	3,600
Restricted stock unit distributions	0	291	(291)	0	0	(636)	(636)
Change, net of tax	0	0	0	0	5,159	0	5,159
Balance at Dec. 31, 2019	39	132,292	1,973,700	(349,220)	(37,310)	(22,967)	1,696,534
Net income (loss)	0	0	0	(9,457)	0	0	(9,457)
Stock issued to directors	0	97	1,389	0	0	0	1,486
Stock issued for 401(k) match	0	397	4,227	0	0	0	4,624
Restricted stock units granted	0	0	4,975	0	0	0	4,975
Common stock and Series B Preferred stock dividends declared	0	0	0	(9,151)	0	0	(9,151)
Common stock issued for employee incentive compensation	0	700	4,396	0	0	(1,266)	3,830
Common stock issued to pension plans	0	717	15,315	0	0	0	16,032
Restricted stock unit distributions	0	426	(426)	0	0	(1,479)	(1,479)
Change, net of tax	0	0	0	0	4,421	0	4,421
Treasury shares issued to charitable foundation	0	0	0	(246)	0	2,216	1,970
Balance at Dec. 31, 2020	39	134,629	2,003,576	(368,074)	(32,889)	(23,496)	1,713,785
Net income (loss)	0	0	0	35,095	0	0	35,095
Stock issued to directors	0	52	1,792	0	0	0	1,844
Stock issued for 401(k) match	0	172	4,167	0	0	0	4,339
Restricted stock units granted	0	0	4,238	0	0	0	4,238
Common stock and Series B Preferred stock dividends declared	0	0	0	(20,672)	0	0	(20,672)
Common stock issued to pension plans	0	1,125	21,125	0	0	0	22,250
Restricted stock unit distributions	0	413	(413)	0	0	(4,525)	(4,525)
Change, net of tax	0	0	0	0	4,433	0	4,433
Balance at Dec. 31, 2021	$ 39	$ 136,391	$ 2,034,485	$ (353,651)	$ (28,456)	$ (28,021)	$ 1,760,787