CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Cash flows from operating activities--
Net earnings	$ 149,408	$ 148,271
Adjustments to reconcile net earnings to net cash provided by operating activities--
Depreciation and amortization expense	38,622	32,315
Non-cash share-based compensation	1,818	6,505
Deferred taxes	5,573	17,579
Gain (Loss) on Disposition of Assets	0	(12,042)
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0	2,929
Changes in assets and liabilities, net of acquisitions
Accounts receivable, net	(28,233)	17,257
Inventories, net	392	(25,607)
Prepaid expenses and other assets	(3,829)	(17,442)
Accounts payable	13,618	(10,832)
Accrued expenses and other liabilities	(30,734)	(72,897)
Net cash provided by operating activities	146,635	86,036
Cash flows from investing activities--
Additions to property and equipment	(24,208)	(31,708)
Proceeds from Sale of Property, Plant, and Equipment	0	14,278
Payments to Acquire Intangible Assets	(5,399)	0
Payments to Acquire Businesses, Net of Cash Acquired	(1,144,541)	(119,262)
Net cash (used in) investing activities	(1,174,148)	(136,692)
Cash flows from financing activities--
Proceeds from Lines of Credit	1,466,974	264,635
Repayments of Lines of Credit	(431,081)	(194,087)
Net (repayments) proceeds under foreign bank loan	(3,008)	(1,130)
Proceeds from (Repayments of) Notes Payable	(3)	(17)
Repurchase of treasury stock	0	(24,645)
Net cash (used in) provided by financing activities	1,032,882	44,756
Effect of exchange rates on cash and cash equivalents	(2,739)	2,288
Changes in cash and cash equivalents--
Net (decrease) increase in cash and cash equivalents	2,630	(3,612)
Cash and cash equivalents at beginning of year	89,654	68,485
Cash and cash equivalents at end of quarter	92,284	64,873
CVP Systems [Member]
Changes in cash and cash equivalents--
Stock Issued During Period, Value, Acquisitions	$ 0	$ 12,330