Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities:
Net Income (Loss)	$ (24,827)	$ (49,133)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	52,486	54,128
Deferred income tax provision (benefit)	(2,907)	2,819
Net loss (gain) on sales of property and equipment	(11)	37
Noncash compensation	2,980	2,812
Excluding the effects of acquisitions, increase (decrease) in cash from:
Accounts receivable and contract assets	22,181	20,815
Inventory	(15,026)	(2,985)
Other operating assets	1,010	6,535
Currency translation effect on working capital, excluding cash	371	5,559
Current liabilities	(15,058)	(41,194)
Other operating liabilities	(2,075)	6,225
Total adjustments to net income	43,951	54,751
Net Cash Provided by Operating Activities	19,124	5,618
Cash Flows from Investing Activities:
Purchases of property and equipment	(29,964)	(25,732)
Business acquisitions, net of cash acquired	0	(68,398)
Other investing activities	0	202
Distributions of capital from unconsolidated affiliates	0	1,579
Dispositions of property and equipment	50	0
Net Cash Used in Investing Activities	(29,914)	(92,349)
Cash Flows from Financing Activities:
Net proceeds from issuance of 6.000% Senior Notes, net of issuance costs	0	295,879
Repayment of term loan facility	0	(300,000)
Other financing activities	(2,338)	(1,635)
Net Cash Used in Financing Activities	(2,338)	(5,756)
Effect of exchange rates on cash	632	(2,919)
Net Increase (Decrease) in Cash and Cash Equivalents	(12,496)	(95,406)
Cash and Cash Equivalents—Beginning of Period	354,259	430,316
Cash and Cash Equivalents—End of Period	$ 341,763	$ 334,910