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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income $ 7,790 $ 815
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 7,015 6,959
Deferred income taxes 3,275 5,558
Restructuring charges 720 2,225
Gains on disposition of property and other assets (152) (3)
Share-based compensation expense 1,819 1,217
Excess tax benefit from share-based compensation arrangements (378) (269)
Other non-cash items, net 1,641 1,375
Change in operating assets and liabilities (excluding the impact of acquisitions):    
Receivables (22,612) (16,313)
Inventories 1,700 (2,151)
Accounts payable 12,368 16,925
Restructuring liabilities (1,443) (809)
Accrued compensation (11,035) (6,438)
Customer deposits (8,414) (5,405)
Income taxes payable (84) 496
Other assets and liabilities, net 2,215 (1,397)
Net cash provided by (used in) operating activities (5,575) 2,785
Cash flows from investing activities:    
Capital expenditures (8,320) (7,548)
Acquisition of businesses, net of cash acquired (647) (23,546)
Proceeds from dispositions of property and other assets 173 9
Net cash used in investing activities (8,794) (31,085)
Cash flows from financing activities:    
Payments on debt and capital lease obligations (483) (669)
Dividends paid on common stock (2,034) (813)
Common stock purchased for treasury (1,187) (1,000)
Excess tax benefit from share-based compensation arrangements 378 269
Proceeds from exercise of stock options 535 89
Net cash used in financing activities (2,791) (2,124)
Effect of exchange rate changes on cash and cash equivalents (1,284) 1,655
Net change in cash and cash equivalents (18,444) (28,769)
Cash and cash equivalents, beginning of year 114,171 100,376
Cash and cash equivalents, end of period 95,727 71,607
Supplemental disclosure of cash flow information    
Cash paid for income taxes 2,181 1,809
Cash paid for interest 234 286
Equipment acquired under capital leases $ 393 $ 186