Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock Voting	Common Stock Class B Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Impact of ASC 326 Adoption	Impact of ASC 326 Adoption Retained Earnings
Beginning Balance at Dec. 31, 2018	$ 945,534	$ 231,128	$ 518	$ 5	$ 625,834	$ 140,952	$ (28,786)	$ (24,117)
Comprehensive income (loss):
Net (loss) income	23,619					23,619
Other comprehensive income (loss), net	11,449							11,449
Issuance of common stock	0		2		(2)
Share-based compensation expense	2,350				2,350
Restricted stock surrendered due to employee tax liability	(876)				(876)
Shares purchased under the Dividend Reinvestment Plan	(76)				0	(76)
Stock appreciation right dividend equivalents	(296)					(296)
Dividends declared	(9,544)					(9,544)
Preferred stock dividends	(8,616)					(8,616)
Ending Balance at Jun. 30, 2019	963,544	231,128	520	5	627,306	146,039	(28,786)	(12,668)
Beginning Balance at Dec. 31, 2018	945,534	231,128	518	5	625,834	140,952	(28,786)	(24,117)
Ending Balance at Dec. 31, 2019	$ 907,245	189,825	520	5	629,848	127,733	(28,786)	(11,900)	$ (4,503)	$ (4,503)
Comprehensive income (loss):
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning Balance at Mar. 31, 2019	$ 948,325	231,128	518	5	626,608	136,943	(28,786)	(18,091)
Comprehensive income (loss):
Net (loss) income	16,582					16,582
Other comprehensive income (loss), net	5,423							5,423
Issuance of common stock	0		2		(2)
Share-based compensation expense	1,497				1,497
Restricted stock surrendered due to employee tax liability	(797)				(797)
Shares purchased under the Dividend Reinvestment Plan	(26)				0	(26)
Stock appreciation right dividend equivalents	(94)					(94)
Dividends declared	(3,058)					(3,058)
Preferred stock dividends	(4,308)					(4,308)
Ending Balance at Jun. 30, 2019	963,544	231,128	520	5	627,306	146,039	(28,786)	(12,668)
Beginning Balance at Dec. 31, 2019	907,245	189,825	520	5	629,848	127,733	(28,786)	(11,900)	(4,503)	(4,503)
Comprehensive income (loss):
Net (loss) income	(6,593)
Other comprehensive income (loss), net	(42,248)
Ending Balance at Mar. 31, 2020	835,002	187,687	520	5	631,125	110,640	(40,827)	(54,148)
Beginning Balance at Dec. 31, 2019	907,245	189,825	520	5	629,848	127,733	(28,786)	(11,900)	$ (4,503)	$ (4,503)
Comprehensive income (loss):
Net (loss) income	(25,042)					(25,042)
Other comprehensive income (loss), net	(3,665)							(3,665)
Issuance of common stock	0		2		(2)
Redemption of preferred stock	(4,213)	(4,788)				575
Purchase of treasury shares	(12,041)						(12,041)
Share-based compensation expense	3,046				3,046
Restricted stock surrendered due to employee tax liability	(775)				(775)
Shares purchased under the Dividend Reinvestment Plan	(47)					(47)
Stock appreciation right dividend equivalents	(188)					(188)
Dividends declared	(5,883)					(5,883)
Preferred stock dividends	(6,975)					(6,975)
Ending Balance at Jun. 30, 2020	$ 846,959	185,037	522	5	632,117	85,670	(40,827)	(15,565)
Comprehensive income (loss):
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning Balance at Mar. 31, 2020	$ 835,002	187,687	520	5	631,125	110,640	(40,827)	(54,148)
Comprehensive income (loss):
Net (loss) income	(18,449)					(18,449)
Other comprehensive income (loss), net	38,583							38,583
Issuance of common stock	0		2		(2)
Redemption of preferred stock	(2,601)	(2,650)				49
Share-based compensation expense	1,470				1,470
Restricted stock surrendered due to employee tax liability	(476)				(476)
Shares purchased under the Dividend Reinvestment Plan	(28)					(28)
Stock appreciation right dividend equivalents	(94)					(94)
Dividends declared	(3,006)					(3,006)
Preferred stock dividends	(3,442)					(3,442)
Ending Balance at Jun. 30, 2020	$ 846,959	$ 185,037	$ 522	$ 5	$ 632,117	$ 85,670	$ (40,827)	$ (15,565)