Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities:
Net income (loss)	$ (60,009)	$ (82,209)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	102,790	113,971
Deferred income tax provision (benefit)	(3,686)	(23,034)
Net loss (gain) on sales of property and equipment	(1,592)	860
Noncash compensation	5,835	5,985
Excluding the effects of acquisitions, increase (decrease) in cash from:
Accounts receivable and contract assets	53,913	(12,161)
Inventory	(18,687)	(3,901)
Other operating assets	11,868	473
Currency translation effect on working capital, excluding cash	2,005	(2,771)
Current liabilities	(18,669)	3,941
Other operating liabilities	(1,059)	14,531
Total adjustments to net income (loss)	132,718	97,894
Net Cash Provided by Operating Activities	72,709	15,685
Cash Flows from Investing Activities:
Purchases of property and equipment	(70,862)	(53,530)
Business acquisitions, net of cash acquired	0	(68,398)
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale	0	33,405
Other investing activities	0	(10,025)
Distributions of capital from unconsolidated affiliates	1,064	2,372
Dispositions of property and equipment	1,679	1,403
Net Cash Used in Investing Activities	(68,119)	(94,773)
Cash Flows from Financing Activities:
Net proceeds from issuance of 6.000% Senior Notes, net of issuance costs	0	295,816
Repayment of term loan facility	0	(300,000)
Other financing activities	(2,682)	(1,594)
Net Cash Used in Financing Activities	(2,682)	(5,778)
Effect of exchange rates on cash	(329)	(5,909)
Net Increase (Decrease) in Cash and Cash Equivalents	1,579	(90,775)
Cash and Cash Equivalents—Beginning of Period	354,259	430,316
Cash and Cash Equivalents—End of Period	$ 355,838	$ 339,541