Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 26,598	$ 27,711
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	21,777	23,560
Deferred income taxes	1,775	(4,242)
Income from discontinued operations	(1,006)	(639)
Restructuring charges	2,207	3,511
Impairment losses	5,413
Gain on sale of facility and related land	(4,775)
Gains on disposition of property and other assets	(223)	(156)
Share-based compensation expense	3,569	4,524
Excess tax benefit from share-based compensation arrangements	(389)	(269)
Other non-cash items, net	3,603	3,646
Change in operating assets and liabilities (excluding the impact of acquisitions):
Receivables	(12,173)	(24,342)
Inventories	(2,161)	(2,238)
Accounts payable	4,704	26,272
Restructuring liabilities	(3,771)	(2,761)
Accrued compensation	(8,768)	5,783
Customer deposits	(5,806)	(1,994)
Income taxes payable	2,115	8,185
Other assets and liabilities, net	(5,356)	2,255
Net cash provided by operating activities	27,333	68,806
Cash flows from investing activities:
Capital expenditures	(26,927)	(19,912)
Acquisition of businesses, net of cash acquired	(647)	(23,546)
Proceeds from sale of facility and related land	12,696
Proceeds from dispositions of property and other assets	422	194
Proceeds from sale of land - discontinued operations	1,645	1,041
Net cash used in investing activities	(12,811)	(42,223)
Cash flows from financing activities:
Payments on debt and capital lease obligations	(1,027)	(2,308)
Dividends paid on common stock	(6,095)	(2,429)
Common stock purchased for treasury	(1,294)	(1,038)
Excess tax benefit from share-based compensation arrangements	389	269
Proceeds from exercise of stock options	540	90
Net cash used in financing activities	(7,487)	(5,416)
Effect of exchange rate changes on cash and cash equivalents	(1,084)	2,686
Net change in cash and cash equivalents	5,951	23,853
Cash and cash equivalents, beginning of year	114,171	100,376
Cash and cash equivalents, end of period	120,122	124,229
Supplemental disclosure of cash flow information
Cash paid for income taxes	6,956	7,202
Cash paid for interest	633	855
Property and equipment acquired under capital leases	591	690
Property and equipment purchases in accounts payable and accrued liabilities	$ 2,895	$ 5,078