CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities:
Net income	$ 100,039	$ 222,198	$ 225,355
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	121,600	62,107	62,997
Stock-based compensation expense	19,279	19,062	16,445
Other operating activities, net	6,366	(11,175)	(3,652)
Deferred income taxes	(33,538)	13,205	9,137
Changes in assets and liabilities
Increase (Decrease) in Accounts Receivable	47,879	11,453	(22,934)
Inventories	203,827	(47,297)	(8,702)
Increase (Decrease) in Other Operating Assets	(21,199)	(28,785)	(4,239)
Accounts payable	54,127	(23,505)	(9,193)
Accrued payroll and benefit costs	75,556	(39,081)	18,777
Other current and noncurrent liabilities	78,249	(825)	(5,656)
Net cash provided by operating activities	543,931	224,367	296,721
Investing Activities:
Capital expenditures	(56,671)	(44,067)	(36,210)
Acquisition payments, net of cash acquired	(3,707,575)	(27,597)	0
Proceeds from sale of assets	6,721	16,795	12,461
Other investing activities, net	22,376	(5,931)	(10,393)
Net cash used in investing activities	(3,735,149)	(60,800)	(34,142)
Financing Activities:
Proceeds from (Repayments of) Short-term Debt	(11,258)	(29,780)	(1,454)
Proceeds from issuance of long-term debt	5,114,210	1,305,421	1,193,067
Repayments of long-term debt	(1,513,048)	(1,217,434)	(1,318,470)
Repurchase of common stock	(2,901)	(153,049)	(127,169)
Debt issuance costs	(80,231)	(2,707)	0
Payments of Dividends	(30,139)	0	0
Other financing activities, net	(4,108)	12,217	21,068
Net cash provided (used) by financing activities	3,480,741	(109,766)	(275,094)
Effect of exchange rate on cash and cash equivalents	8,710	758	(9,095)
Net change in cash and cash equivalents	298,233	54,559	(21,610)
Cash and cash equivalents at the beginning of period	150,902	96,343	117,953
Cash and cash equivalents at the end of period	449,135	150,902	96,343
Supplemental disclosures:
Cash paid for interest	169,620	65,275	64,702
Cash paid for taxes	$ 56,186	$ 64,531	$ 61,983