CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net earnings	$ 71,996	$ 65,581
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	30,635	29,033
Provision for losses on accounts receivable	2,826	3,387
Write-downs of inventories	2,240	6,319
Write-off of computer software development costs	36	1,390
Non-cash stock-based compensation	6,467	5,579
Gain on bargain purchase	(2,022)
Excess tax benefit from employee gains on stock-based compensation	(1,942)	(1,569)
Deferred income taxes	5,913	7,683
Changes in assets and liabilities:
Decrease in accounts receivable	268,880	230,630
Decrease in inventories	22,687	1,901
(Increase) decrease in other current assets	(9,673)	21,021
Decrease (increase) in other assets	6,082	(2,169)
Decrease in accounts payable	(309,447)	(281,221)
Decrease in deferred revenue	(11,896)	(30,937)
Decrease in accrued expenses and other liabilities	(52,690)	(46,566)
Net cash provided by operating activities	30,092	10,062
Cash flows from investing activities:
Acquisition, net of cash acquired	(3,831)
Purchases of property and equipment	(22,454)	(16,883)
Net cash used in investing activities	(26,285)	(16,883)
Cash flows from financing activities:
Borrowings on senior revolving credit facility	713,953	971,000
Repayments on senior revolving credit facility	(826,953)	(905,500)
Borrowings on accounts receivable securitization financing facility	450,000	40,000
Repayments on accounts receivable securitization financing facility	(340,000)	(40,000)
Payments on capital lease obligation	(761)	(746)
Net borrowings (repayments) under inventory financing facility	9,290	(33,214)
Payment of deferred financing fees	(2,554)
Proceeds from sales of common stock under employee stock plans	2,641	38
Excess tax benefit from employee gains on stock-based compensation	1,942	1,569
Payment of payroll taxes on stock-based compensation through shares withheld	(3,046)	(2,544)
Repurchases of common stock		(50,000)
Net cash provided by (used in) financing activities	4,512	(19,397)
Foreign currency exchange effect on cash flows	4,020	1,135
Increase (decrease) in cash and cash equivalents	12,339	(25,083)
Cash and cash equivalents at beginning of period	128,336	123,763
Cash and cash equivalents at end of period	$ 140,675	$ 98,680