CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating Activities
Net income	$ 256,797	$ 212,603
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	82,974	76,970
Stock-based compensation expense	20,484	14,539
Loss on disposal of property, plant and equipment	4,057	1,633
Changes in operating assets and liabilities, net of acquisitions
Accounts receivable and unbilled accounts receivable	(100,212)	(60,246)
Inventories	(125,523)	(53,365)
Accounts payable	4,194	(121,389)
Accrued income taxes	(43,770)	(35,942)
Accrued liabilities and customer deposits	16,369	81,270
Other assets and liabilities	(77,332)	(89,562)
Net cash provided by operating activities	38,038	26,511
Investing Activities
Purchase of property, plant and equipment	(64,232)	(60,263)
Proceeds from disposal of property, plant and equipment	9,139	1,066
Acquisitions of businesses, net of cash acquired	(49,067)	(846,675)
Net cash used for investing activities	(104,160)	(905,872)
Financing Activities
Proceeds from debt	3,490,185	883,473
Payments of debt	(1,466,626)	(918,919)
Proceeds from exercise of stock options and other benefit plans	13,138	2,888
Payment of income tax withholding on share-based compensation	(6,705)	(6,798)
Cash dividends ($0.36 and $0.20 per share for the nine months ended September 30, 2018 and 2017, respectively)	(34,682)	(30,693)
Net cash provided by (used for) financing activities	1,995,310	(70,049)
Effect of changes in currency exchange rates	(27,208)	34,258
Increase (decrease) in cash	1,901,980	(915,152)
Cash, cash equivalents, and restricted cash, beginning of period	233,401	1,143,232
Cash, cash equivalents, and restricted cash, end of period	$ 2,135,381	$ 228,080