Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance, shares at Dec. 31, 2016		109,519,000
Beginning balance at Dec. 31, 2016	$ 264,933	$ 1,095	$ 827,107	$ 800,640	$ (1,347,677)	$ (16,232)
Net earnings	6,653			6,653
Foreign currency translation adjustments, net of tax $158, ($73), and $2,822 for 2019, 2018, and 2017, respectively	5,241					5,241
Total other comprehensive income (loss)	5,241
Exercise of stock options, shares		27,000
Exercise of stock options	270		270
Vesting of restricted share units, shares		136,000
Vesting of restricted share units	0	$ 2	(2)
Stock-based compensation expense	3,896		(3,896)
Dividends declared	(8,550)			(8,550)
Ending balance, shares at Dec. 31, 2017		109,682,000
Ending balance at Dec. 31, 2017	272,443	$ 1,097	831,271	798,743	(1,347,677)	(10,991)
Net earnings	8,492			8,492
Foreign currency translation adjustments, net of tax $158, ($73), and $2,822 for 2019, 2018, and 2017, respectively	(274)					(274)
Total other comprehensive income (loss)	(274)
Exercise of stock options, shares		138,000
Exercise of stock options	1,400	$ 1	1,399
Vesting of restricted share units, shares		90,000
Vesting of restricted share units	0	$ 1	(1)
Tax effect of stock awards vested and options exercised	(194)		(194)
Stock-based compensation expense	5,961		(5,961)
Ending balance, shares at Dec. 31, 2018		109,910,000
Ending balance at Dec. 31, 2018	286,517	$ 1,099	838,436	805,924	(1,347,677)	(11,265)
ASC adoption	(1,311)			(1,311)
Net earnings	173,546			173,546
Foreign currency translation adjustments, net of tax $158, ($73), and $2,822 for 2019, 2018, and 2017, respectively	595					595
Total other comprehensive income (loss)	595
Purchase of treasury stock	$ (1,292)				(1,292)
Exercise of stock options, shares	551,008	550,000
Exercise of stock options	$ 6,799	$ 5	6,794
Vesting of restricted share units, shares		267,000
Vesting of restricted share units	0	$ 2	(2)
Tax effect of stock awards vested and options exercised	(1,734)		(1,734)
Stock-based compensation expense	6,958		(6,958)
Dividends declared	(29,619)			29,619
Merchants Preferred acquisition, shares		439,000
Merchants Preferred acquisition	19,169	$ 4	19,165
Ending balance, shares at Dec. 31, 2019		111,166,000
Ending balance at Dec. 31, 2019	458,963	$ 1,110	$ 869,617	947,875	$ (1,348,969)	$ (10,670)
ASC adoption	$ (1,976)			$ (1,976)