Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities
Net income	$ 6,583	$ 9,743	$ 1,079
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	30,731	29,126	28,252
Deferred income taxes	11,274	(924)	744
Income from discontinued operations	(624)	(451)	(262)
Restructuring charges	4,942	3,782	4,222
Impairment charges	0	0	302
Losses (gains) on dispositions of property and other assets	(206)	(42)	45
Share-based compensation expense	7,232	4,413	3,518
Excess tax benefit from share-based compensation arrangements	(293)	(54)	(27)
Other non-cash items, net	10,157	4,659	4,580
Change in operating assets and liabilities (excluding the impact of acquisitions):
Receivables	142	(18,092)	(3,042)
Inventories	195	3,729	6,148
Accounts payable	4,310	4,372	4,637
Restructuring liabilities	(4,694)	(3,888)	(6,718)
Accrued compensation	1,631	4,563	6,966
Customer deposits	926	4,950	2,000
Income taxes payable	467	(2,694)	(1,264)
Other assets and liabilities, net	(3,587)	(8,456)	(7,897)
Net cash provided by operating activities	69,186	34,736	43,283
Cash flows from investing activities
Capital expenditures	(27,675)	(21,538)	(17,040)
Acquisition of businesses, net of cash acquired	(23,546)	(41,105)
Proceeds from sale of land-discontinued operations	1,041
Proceeds from dispositions of property and other assets	322	440	14,753
Proceeds from sale of short-term investments	384
Net cash used in investing activities	(49,474)	(62,203)	(2,287)
Cash flows from financing activities
Payments on debt and capital lease obligations	(2,685)	(7,375)	(4,900)
Dividends paid on common stock	(4,454)	(3,241)	(3,275)
Common stock purchased for treasury	(1,656)	(5,230)	(6,906)
Debt issuance costs		(1,001)
Excess tax benefit from share-based compensation arrangements	293	54	27
Proceeds from exercise of stock options	248	296	593
Net cash used in financing activities	(8,254)	(16,497)	(14,461)
Effect of exchange rate changes on cash and cash equivalents	2,337	(1,501)	2,964
Net change in cash and cash equivalents	13,795	(45,465)	29,499
Cash and cash equivalents, beginning of year	100,376	145,841	116,342
Cash and cash equivalents, end of year	114,171	100,376	145,841
Supplemental disclosure of cash flow information
Cash paid for income taxes	8,386	10,213	7,931
Cash paid for interest	1,103	1,088	1,131
Equipment acquired under capital leases	$ 1,011	$ 1,327	$ 963