CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 12,646,000	$ 7,790,000
Loss (income) from discontinued operations, net of taxes	273,000	(5,000)
Net income from continuing operations	12,919,000	7,785,000
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	15,956,000	15,435,000
Amortization	2,432,000	3,449,000
Amortization of debt issuance costs	295,000	468,000
Net legal settlements and related expenses	82,000	12,000
Payments for legal settlements and related expenses	(17,000)	(12,000)
Deferred income taxes	3,342,000	655,000
Restructuring costs	113,000
Payments for restructuring costs	(1,152,000)	(4,540,000)
Asset impairments	45,000	54,000
Equity-based compensation	4,184,000	3,587,000
Excess tax benefits from share-based payment arrangements	(264,000)
Provision for doubtful accounts	576,000	378,000
Changes in working capital	(9,344,000)	(7,119,000)
Net cash provided by operating activities from continuing operations	29,167,000	20,152,000
Net cash (used in) provided by operating activities from discontinued operations	(630,000)	27,000
Net cash provided by operating activities	28,537,000	20,179,000
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(15,018,000)	(15,306,000)
Other investing activities	(346,000)	(1,094,000)
Business dispositions		1,951,000
Net cash used in investing activities from continuing operations	(15,364,000)	(14,449,000)
Net cash used in investing activities from discontinued operations	(60,000)
Net cash used in investing activities	(15,424,000)	(14,449,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments under borrowing arrangements	(35,140,000)	(30,790,000)
Proceeds from borrowing arrangements	24,729,000	44,971,000
Payments of debt issuance costs	(23,000)
Excess tax benefits of share-based payment arrangements	264,000
Purchase of treasury stock, at cost	(11,437,000)	(11,992,000)
Exercise of stock options	853,000
Net cash (used in) provided by financing activities from continuing operations	(20,754,000)	2,189,000
Net cash used in financing activities from discontinued operations
Net cash (used in) provided by financing activities	(20,754,000)	2,189,000
Effect of exchange rate changes on cash and equivalents	(391,000)	998,000
NET (DECREASE) INCREASE IN CASH AND EQUIVALENTS	(8,032,000)	8,917,000
CASH AND EQUIVALENTS, beginning of period	32,033,000	15,101,000
CASH AND EQUIVALENTS, end of period	$ 24,001,000	$ 24,018,000