Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities:
Net Income	$ (5,402)	$ 47,412
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	106,967	119,760
Deferred income tax provision	(23,771)	761
Net loss (gain) on sales of property and equipment	320	8
Noncash compensation	7,710	8,558
Excluding the effects of acquisitions, increase (decrease) in cash from:
Accounts receivable	23,293	65,660
Inventory	13,494	(14,570)
Other operating assets	(10,855)	48,533
Currency translation effect on working capital	(5,961)	3,593
Current liabilities	(25,258)	(119,182)
Other operating liabilities	22,067	(15,932)
Total adjustments to net income	108,006	97,189
Net Cash Provided by Operating Activities	102,604	144,601
Cash Flows from Investing Activities:
Purchases of property and equipment	(41,300)	(52,944)
Payments for (Proceeds from) Other Investing Activities	1,014	30,158
Distributions of capital from unconsolidated affiliates	1,424	3,926
Dispositions of property and equipment	630	1,976
Net Cash Used in Investing Activities	(40,260)	(77,200)
Cash Flows from Financing Activities:
Cash Dividends	(29,479)	(52,952)
Proceeds from (Payments for) Other Financing Activities	(2,049)	(1,945)
Net Cash Provided by (Used in) Financing Activities	(31,528)	(54,897)
Effect of Exchange Rate on Cash and Cash Equivalents	1,330	(4,549)
Net Increase (Decrease) in Cash and Cash Equivalents	32,146	7,955
Cash and Cash Equivalents-Beginning of Period	450,193	385,235
Cash and Cash Equivalents-End of Period	$ 482,339	$ 393,190