Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities:
Net Income	$ (49,133)	$ (7,534)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	54,128	53,663
Deferred income tax provision	2,819	(19,943)
Net loss (gain) on sales of property and equipment	37	551
Noncash compensation	2,812	3,718
Excluding the effects of acquisitions, increase (decrease) in cash from:
Accounts receivable	20,815	59,997
Inventory	(2,985)	(17,515)
Other operating assets	6,535	(6,372)
Currency translation effect on working capital	5,559	1,472
Current liabilities	(41,194)	(30,636)
Other operating liabilities	6,225	21,604
Total adjustments to net income	54,751	66,539
Net Cash Provided by Operating Activities	5,618	59,005
Cash Flows from Investing Activities:
Purchases of property and equipment	(25,732)	(17,807)
Payments to Acquire Businesses, Net of Cash Acquired	(68,398)	0
Payments for (Proceeds from) Other Investing Activities	(202)	14,993
Distributions of capital from unconsolidated affiliates	1,579	707
Dispositions of property and equipment	0	1,357
Net Cash Used in Investing Activities	(92,349)	(30,736)
Cash Flows from Financing Activities:
Proceeds from Issuance of Long-term Debt	295,879	0
Repayments of Long-term Debt	(300,000)	0
Cash Dividends	0	(14,739)
Proceeds from (Payments for) Other Financing Activities	(1,635)	(1,894)
Net Cash Provided by (Used in) Financing Activities	(5,756)	(16,633)
Effect of Exchange Rate on Cash and Cash Equivalents	(2,919)	687
Net Increase (Decrease) in Cash and Cash Equivalents	(95,406)	12,323
Cash and Cash Equivalents-Beginning of Period	430,316	450,193
Cash and Cash Equivalents-End of Period	$ 334,910	$ 462,516