CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012
Cash flows relating to operating activities
Net income	$ 84,707	$ 79,338
Less: Income (loss) from discontinued operations	(1,183)	(63)
Income from continuing operations	85,890	79,401
Adjustments to reconcile net income from continuing operations to net cash provided by operating activities:
Depreciation and amortization	67,336	60,617
Amortization of debt issuance costs and discounts	9,124	13,136
Non-cash compensation	18,231	15,828
Deferred income taxes	8,675	(1,338)
Other, net	(2,496)	7,493
Changes in assets and liabilities:
Trade receivables	(22,663)	(27,931)
Inventories	1,445	(2,183)
Other assets	(7,917)	1,201
Accounts payable	(7,688)	(6,743)
Accrued compensation	10,500	6,287
Deferred revenue	(2,289)	283
Accrued liabilities	3,285	(1,518)
Taxes payable and prepaid taxes	(9,557)	7,323
Other liabilities	(5,326)	(8,177)
Net cash provided by operating activities	146,550	143,679
Cash flows relating to investing activities
Payments to Acquire Businesses, Net of Cash Acquired	(24,218)	(16,902)
Capital expenditures	(25,319)	(33,795)
Purchases of investments	(15,341)	(10,814)
Proceeds from sale of investments	10,437	23,549
Other, net	108	2,746
Net cash used in investing activities	(54,333)	(35,216)
Cash flows relating to financing activities
Proceeds from long-term debt and revolving credit agreement	467,804	53,115
Proceeds from exercises of stock options and warrants	58,986	11,916
Payments on long-term debt, capital lease obligation and revolving credit agreement	(502,241)	(112,731)
Purchase of treasury stock	(91,703)	(45,842)
Other, net	(1,176)	535
Net cash used in financing activities	(68,330)	(93,007)
Discontinued operations
Net cash used in operating activities	(1,533)	(292)
Net cash provided by discontinued operations	(1,533)	(292)
Effect of exchange rate changes on cash and cash equivalents	(1,585)	(845)
Net change in cash and cash equivalents	20,769	14,319
Cash and cash equivalents, beginning of period	109,685	68,905
Cash and cash equivalents, end of period	130,454	83,224
Supplemental cash flow information
Capitalized interest	$ 79	$ 472