Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities:
Net Income	$ (148,188)	$ (7,170)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	164,674	160,480
Deferred income tax provision	27,021	(25,065)
Net loss (gain) on sales of property and equipment	(8,513)	429
Noncash compensation	8,562	10,854
Excluding the effects of acquisitions, increase (decrease) in cash from:
Accounts receivable	(85,278)	25,501
Inventory	(7,094)	35,000
Other operating assets	6,377	(20,162)
Currency translation effect on working capital	2,495	253
Current liabilities	60,998	(56,148)
Other operating liabilities	14,602	20,042
Total adjustments to net income	183,844	151,184
Net Cash Provided by Operating Activities	35,656	144,014
Cash Flows from Investing Activities:
Purchases of property and equipment	(83,919)	(59,900)
Payments to Acquire Businesses, Net of Cash Acquired	(68,398)	(11,278)
Proceeds from Sale of Available-for-sale Securities, Debt	62,021	0
Payments for (Proceeds from) Other Investing Activities	(10,417)	(10,777)
Distributions of capital from unconsolidated affiliates	2,372	2,556
Dispositions of property and equipment	15,897	635
Net Cash Used in Investing Activities	(82,444)	(78,764)
Cash Flows from Financing Activities:
Proceeds from Issuance of Long-term Debt	295,816	0
Repayments of Long-term Debt	(300,000)	0
Cash Dividends	0	(44,220)
Proceeds from (Payments for) Other Financing Activities	(1,565)	(1,772)
Net Cash Provided by (Used in) Financing Activities	(5,749)	(45,992)
Effect of Exchange Rate on Cash and Cash Equivalents	(10,629)	2,930
Net Increase (Decrease) in Cash and Cash Equivalents	(63,166)	22,188
Cash and Cash Equivalents-Beginning of Period	430,316	$ 450,193
Cash and Cash Equivalents-End of Period	$ 367,150