Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019
Cash Operating Activities:
Net income	$ 48,347	$ 55,175
Adjustments to reconcile net income to cash used in operating activities:
Depreciation and amortization	99,755	99,749
Deferred income taxes	(1,844)	14,428
Gain on sale of business units, property and equipment	(2,697)	(1,428)
Adjustment to carrying value of assets	5,675	5,669
Amortization of deferred financing costs	1,890	1,446
Stock-based compensation	11,662	10,585
Contributions to U.S. pension plan	(4,399)	(6,198)
Amortization of U.S. pension expense	5,175	6,675
Other items, net	20,034	3,649
Net change in operating assets and liabilities, net of effect of acquisitions:
Accounts receivable	(97,179)	(98,525)
Inventories	(2,045)	(6,798)
Other assets	(3,668)	(1,905)
Accounts payable and accrued expenses	114,748	72,785
Change in short term and long-term tax liabilities	15,127	9,585
Net cash provided by operating activities	210,581	164,892
INVESTING ACTIVITIES
Purchases of property and equipment	(50,628)	(76,397)
Proceeds from sale of business units, property and equipment	9,248	7,542
Purchase of intangible assets	(16,268)	(28,174)
Purchases of businesses, net of cash acquired	0	(57,264)
Cash received for notes receivable	538	353
Net cash used in investing activities	(57,110)	(153,940)
FINANCING ACTIVITIES
Change in long-term debt	221,642	25,068
Common stock issued for exercise of options	1,222	1,976
Common stock repurchased	(5,000)	(19,994)
Payments to tax authorities for employee share-based compensation	(756)	(986)
Net cash provided by financing activities	217,108	6,064
Effect of foreign currency exchange rates on cash	6,156	(2,981)
Net increase in cash and cash equivalents	376,735	14,035
Cash, cash equivalents and restricted cash, beginning	229,876	117,623
Cash, cash equivalents and restricted cash, ending	$ 606,611	$ 131,658