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]	Non-Controlling Interest [Member]	Total
Balances at Dec. 31, 2015		$ 2	$ 148,523	$ (7,922)	$ 318,579	$ 923	$ 460,105
Balances, Shares at Dec. 31, 2015		20,133
Net income					5,997	37	6,034
Foreign currency translation adjustment				(815)			(815)
Disposal of subsidiary				605		$ (960)	(355)
Repurchase of common stock			(9,176)				(9,176)
Repurchase of common stock, Shares		(1,104)
Stock based compensation - options			1,292				1,292
Stock based compensation - restricted stock			440				440
Stock based compensation - restricted stock, Shares		31
Payment of income tax withheld on vested restricted stock			(21)				(21)
Payment of income tax withheld on vested restricted stock, Shares		(3)
Balances at Dec. 31, 2016		$ 2	141,058	(8,132)	324,576		457,504
Balances, Shares at Dec. 31, 2016		19,057
Net income					72,060		72,060
Adoption of ASU 2016-09					1,004		1,004
Foreign currency translation adjustment				2,010			2,010
Issuance of common and preferred stock, net of offering costs			29,148				29,148
Issuance of common and preferred stock, net of offering costs, Shares		889
Exercise of stock options			145				145
Exercise of stock options, Shares		414
Stock based compensation - options			1,593				1,593
Stock based compensation - restricted stock			494				494
Stock based compensation - restricted stock, Shares		37
Payment of income tax withheld on vested restricted stock			(113)				(113)
Payment of income tax withheld on vested restricted stock, Shares		(6)
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					(5,124)		(5,124)
Foreign currency translation adjustment				(391)			(391)
Issuance of common and preferred stock, net of offering costs	$ 103,865		(1,552)				102,313
Issuance of common and preferred stock, 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 - options			1,236				1,236
Stock based compensation - restricted stock			1,631				1,631
Stock based compensation - restricted stock, Shares		42
Payment of income tax withheld on vested restricted stock			(129)				(129)
Payment of income tax withheld on vested restricted stock, Shares		(7)
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