CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net income	$ 190,836	$ 204,827
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	80,259	80,174
Equity-based compensation	17,844	15,308
Deferred income taxes	5,927	12,091
Other adjustments	(264)	728
Changes in certain assets and liabilities:
Accounts receivable	(154,072)	(61,062)
Inventories	44,505	39,469
Other assets	(1,541)	301
Accounts payable	51,596	3,206
Income taxes receivable/payable	52,385	49,850
Accrued expenses	(76,194)	(163,339)
Net cash provided by operating activities	211,281	181,553
Investing activities:
Purchases of property, plant and equipment	(217,535)	(54,436)
Purchases of short-term investments	(149,359)	(49,677)
Proceeds from maturities of short-term investments	192,340	104,737
Acquisition of business, net of cash and restricted cash acquired		(93,412)
Other investing activities	518	364
Net cash used in investing activities	(174,036)	(92,424)
Financing activities:
Issuance of current and long-term debt	216,261	121,234
Repayment of current and long-term debt	(235,757)	(115,271)
Dividends paid	(51,481)	(42,239)
Purchases of treasury stock	(106,529)	(84,308)
Other financing activities	(6,152)	(5,720)
Net cash used in financing activities	(183,658)	(126,304)
Decrease in cash, cash equivalents, and restricted cash	(146,413)	(37,175)
Cash, cash equivalents, and restricted cash at beginning of period	1,387,397	834,423
Cash, cash equivalents, and restricted cash at end of period	1,240,984	797,248
Supplemental disclosure information:
Cash paid for interest	8,785	8,606
Cash paid for income taxes, net	$ 518	$ 1,839