CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]	Total
Balances at Dec. 31, 2017		$ 2	$ 172,325	$ (6,122)	$ 397,640	$ 563,845
Balances, Shares at Dec. 31, 2017		20,391
Net income					78,596	78,596
Preferred stock dividends, $2.125/share					(5,124)	(5,124)
Foreign currency translation adjustment				(391)		(391)
Issuance of common, net of offering costs	$ 103,865					102,313
Issuance of common, net of offering costs			(1,552)
Issuance of common, net of offering costs, Shares	4,155	100
Repurchase of common stock		$ (1,767)	(40,869)			(40,869)
Exercise of stock options			24			24
Exercise of stock options, Shares		5
Stock-based compensation, net of taxes			2,738			2,738
Stock-based compensation, net of taxes, Shares		35
Balances at Dec. 31, 2018	$ 103,865	$ 2	132,666	(6,513)	471,112	701,132
Balances, Shares at Dec. 31, 2018	4,155	18,764
Net income					31,011	31,011
Preferred stock dividends, $2.125/share					(8,829)	(8,829)
Foreign currency translation adjustment				(117)		(117)
Repurchase of common stock			(34,118)			(34,118)
Repurchase of common stock, Shares		(1,458)
Exercise of stock options			1,285			1,285
Exercise of stock options, Shares		130
Stock-based compensation, net of taxes			2,876			2,876
Stock-based compensation, net of taxes, Shares		43
Balances at Dec. 31, 2019	$ 103,865	$ 2	102,709	(6,630)	493,294	693,240
Balances, Shares at Dec. 31, 2019	4,155	17,479
Net income					27,733	27,733
Common stock dividend declared, $0.25/share					(8,877)	(8,877)
Preferred stock dividends, $2.125/share					(8,829)	(8,829)
Change in fair value of derivative instruments designated as cash flow hedges				(374)		(374)
Reclassification of realized loss on derivative instruments designated as cash flow hedges				294		294
Foreign currency translation adjustment				949		949
Income tax benefit related to items of other comprehensive income				18		18
Repurchase of common stock			(7,946)			$ (7,946)
Repurchase of common stock, Shares		(249)				(200)
Exercise of stock options			4,000			$ 4,000
Exercise of stock options, Shares		247
Stock-based compensation, net of taxes			2,032			2,032
Stock-based compensation, net of taxes, Shares		86
Balances at Dec. 31, 2020	$ 103,865	$ 2	$ 100,795	$ (5,743)	$ 503,321	$ 702,240
Balances, Shares at Dec. 31, 2020	4,155	17,563