CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (unaudited) [Abstract]
Sales	$ 323,688	$ 381,603	$ 665,282	$ 730,107
Cost of sales	232,389	270,557	475,934	517,354
Gross profit	91,299	111,046	189,348	212,753
Selling, general and administrative expense	77,304	83,654	157,254	164,207
Operating income	13,995	27,392	32,094	48,546
Other expense (income), net	(145)	141	(394)	(9)
Interest expense	2,592	3,176	5,275	6,573
Income before income taxes	11,548	24,075	27,213	41,982
Provision for income taxes	4,381	9,191	10,395	16,135
Net income	7,167	14,884	16,818	25,847
Preferred stock dividend	22	22	45	45
Net income attributable to common shareholders	7,145	14,862	16,773	25,802
Net income	7,167	14,884	16,818	25,847
Loss on long-term investment, net of income taxes		0		55
Cumulative translation adjustment	1,731	(675)	4,771	615
Comprehensive income	$ 5,436	$ 15,559	$ 12,047	$ 25,177
Basic earnings per share (in dollars per share)	$ 0.50	$ 1.01	$ 1.17	$ 1.75
Weighted average common shares outstanding (in shares)	14,368	14,708	14,380	14,716
Diluted earnings per share (in dollars per share)	$ 0.47	$ 0.96	$ 1.11	$ 1.66
Weighted average common shares and common equivalent shares outstanding (in shares)	15,208	15,548	15,220	15,556