Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 158,501	$ 195,778
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	55,182	53,445
Amortization of debt issuance costs	3,718	3,643
Share-based compensation	12,425	11,502
Loss on debt financing	0	2,350
Amortization of intangible assets	72,174	69,663
Deferred income taxes	13,213	12,266
Unrealized loss on derivative instruments and other	16,717	8,432
Changes in operating assets and liabilities, net of the effects of acquisitions and divestitures:
Accounts receivable, net	(53,775)	(70,295)
Inventories	2,196	(35,132)
Prepaid expenses and other current assets	(1,645)	(6,045)
Accounts payable and accrued expenses	(27,157)	23,430
Income taxes payable	(2,241)	(12,040)
Other	2,858	(3,084)
Net cash provided by operating activities	252,166	253,913
Cash flows from investing activities:
Acquisition, net of cash received	(1,681)	0
Additions to property, plant and equipment and capitalized software	(81,549)	(66,301)
Other	305	5,000
Net cash used in investing activities	(82,925)	(61,301)
Cash flows from financing activities:
Proceeds from exercise of stock options and issuance of ordinary shares	7,099	3,397
Payment of employee restricted stock tax withholdings	(6,778)	(3,641)
Payments on debt	(8,248)	(12,404)
Payments to repurchase ordinary shares	(168,198)	(60,105)
Payments of debt and equity issuance costs	(1,876)	(9,568)
Net cash used in financing activities	(178,001)	(82,321)
Net change in cash and cash equivalents	(8,760)	110,291
Cash and cash equivalents, beginning of period	729,833	753,089
Cash and cash equivalents, end of period	$ 721,073	$ 863,380