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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, 2017 $ 39 $ 100,926 $ 1,619,816 $ (218,089) $ (23,373) $ (18,042) $ 1,461,277
Net loss       (2,870)     (2,870)
Restricted stock units granted     4,043       4,043
Restricted stock units distributed   270 (270)     (1,386) (1,386)
Common stock dividends declared       (3,196)     (3,196)
Series B Preferred Stock dividends declared       (414)     (414)
Common stock issued for 401(k) match   195 2,663       2,858
Other comprehensive loss         (3,521)   (3,521)
Common stock issued for cash, net of offering costs   256 2,830       3,086
Common stock issued to directors   40 553       593
Common stock issued to pension plans   468 5,032       5,500
Common stock and warrants issued for purchase of another company   18,819 233,725       252,544
Common stock issued for employee incentive compensation   309 4,554     (1,308) 3,555
Change in accounting for marketable equity securities       1,289 (1,289)    
Balance at Sep. 30, 2018 39 121,283 1,872,946 (223,280) (28,183) (20,736) 1,722,069
Balance at Jun. 30, 2018 39 101,643 1,628,440 (198,762) (31,929) (20,736) 1,478,695
Net loss       (23,184)     (23,184)
Restricted stock units granted     1,638       1,638
Common stock dividends declared       (1,196)     (1,196)
Series B Preferred Stock dividends declared       (138)     (138)
Common stock issued for 401(k) match   57 728       785
Other comprehensive loss         3,746   3,746
Common stock issued for cash, net of offering costs   256 2,830       3,086
Common stock issued to directors   40 553       593
Common stock issued to pension plans   468 5,032       5,500
Common stock and warrants issued for purchase of another company   18,819 233,725       252,544
Balance at Sep. 30, 2018 39 121,283 1,872,946 (223,280) (28,183) (20,736) 1,722,069
Balance at Dec. 31, 2018 39 121,956 1,880,481 (248,308) (42,469) (20,736) 1,690,963
Net loss       (91,581)     (91,581)
Restricted stock units granted     4,303       4,303
Restricted stock units distributed   291 (291)     (636) (636)
Common stock dividends declared       (3,655)     (3,655)
Series B Preferred Stock dividends declared       (414)     (414)
Common stock issued for 401(k) match   327 2,425       2,752
Other comprehensive loss         4,511   4,511
Common stock issued to directors   63 392       455
Common stock issued to pension plans   597 3,003       3,600
Adjustment to fair value of warrants issued for purchase of another company     (325)       (325)
Common stock issued for employee incentive compensation   899 7,375     (1,603) 6,671
Balance at Sep. 30, 2019 39 124,133 1,897,363 (343,958) (37,958) (22,975) 1,616,644
Balance at Jun. 30, 2019 39 123,701 1,895,617 (323,079) (34,670) (22,380) 1,639,228
Net loss       (19,516)     (19,516)
Restricted stock units granted     1,206       1,206
Restricted stock units distributed   291 (291)     (595) (595)
Common stock dividends declared       (1,225)     (1,225)
Series B Preferred Stock dividends declared       (138)     (138)
Common stock issued for 401(k) match   141 831       972
Other comprehensive loss         (3,288)   (3,288)
Balance at Sep. 30, 2019 $ 39 $ 124,133 $ 1,897,363 $ (343,958) $ (37,958) $ (22,975) $ 1,616,644