CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Net income	$ 204,827	$ 225,475
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	80,174	76,135
Equity-based compensation	15,308	12,841
Deferred income taxes	12,091	9,545
Other adjustments	728	30
Changes in certain assets and liabilities:
Accounts receivable	(61,062)	(118,818)
Inventories	39,469	(80,711)
Other assets	301	(105)
Accounts payable	3,206	66,332
Income taxes receivable/payable	49,850	63,962
Accrued expenses	(163,339)	(76,751)
Net cash provided by operating activities	181,553	177,935
Investing activities:
Purchases of property, plant and equipment	(54,436)	(50,606)
Purchases of short term investments	(49,677)	(40,000)
Proceeds from maturities of short-term investments	104,737
Acquisition of business, net of cash and restricted cash acquired	(93,412)
Other investing activities	364	229
Net cash used in investing activities	(92,424)	(90,377)
Financing activities:
Issuance of current and long-term debt	121,234	93,058
Repayment of current and long-term debt	(115,271)	(113,034)
Dividends paid	(42,239)	(36,797)
Purchases of treasury stock	(84,308)	(69,269)
Other financing activities	(5,720)	(5,180)
Net cash used in financing activities	(126,304)	(131,222)
Decrease in cash, cash equivalents, and restricted cash	(37,175)	(43,664)
Cash, cash equivalents, and restricted cash at beginning of period	834,423	1,035,085
Cash, cash equivalents, and restricted cash at end of period	797,248	991,421
Supplemental disclosure information:
Cash paid for interest	8,606	8,629
Cash paid (received) for income taxes, net	$ 1,839	$ (1,045)