CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 7,078	$ 6,179
Loss from discontinued operations, net of taxes	103	47
Net income from continuing operations	7,181	6,226
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	8,239	7,945
Amortization	462	1,220
Amortization of debt issuance costs	148	147
Net legal settlements and related expenses	93	20
Payments for legal settlements and related expenses	(85)	(10)
Deferred income taxes	2,206	1,935
Restructuring costs	70	161
Payments for restructuring costs	(660)	(622)
Asset impairments	144	25
Equity-based compensation	1,674	2,082
Excess tax benefits from share-based payment arrangements	(244)	(86)
Provision for doubtful accounts	(31)	357
Changes in working capital	(6,786)	(9,825)
Net cash provided by operating activities from continuing operations	12,411	9,575
Net cash used in operating activities from discontinued operations	(105)	(298)
Net cash provided by operating activities	12,306	9,277
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(8,796)	(7,497)
Other investing activities	(425)	(170)
Net cash used in investing activities from continuing operations	(9,221)	(7,667)
Net cash used in investing activities from discontinued operations		(60)
Net cash used in investing activities	(9,221)	(7,727)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments under borrowing arrangements	(12,144)	(15,069)
Proceeds from borrowing arrangements	11,000	7,000
Payments of debt issuance costs		(23)
Excess tax benefits from share-based payment arrangements	244	86
Purchase of treasury stock, at cost	(1,134)	(2,926)
Exercise of stock options		852
Net cash used in financing activities from continuing operations	(2,034)	(10,080)
Net cash used in financing activities from discontinued operations
Net cash used in financing activities	(2,034)	(10,080)
Effect of exchange rate changes on cash and equivalents	(571)	248
NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS	480	(8,282)
CASH AND EQUIVALENTS, beginning of period	20,976	32,033
CASH AND EQUIVALENTS, end of period	$ 21,456	$ 23,751