CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities:
Net income	$ 62,999	$ 59,288
Adjustments to reconcile net income to net cash provided by operations:
Depreciation	41,487	38,357
Amortization	6,002	2,818
Stock based compensation	6,565	7,511
Provision for (recovery of) doubtful accounts	497	94
(Gain) loss on disposition of fixed assets	310	(859)
Deferred income taxes	671	(2,733)
Defined benefit plan expense	3,858	4,872
Equity in results of affiliates	95	65
Changes in balance sheet items, excluding effects from acquisitions and foreign currency adjustments:
Accounts and other receivables	(35,301)	(67,484)
Inventories	(13,097)	(18,575)
Prepaid and other current assets	(2,282)	129
Accounts payable and accrued liabilities	6,865	26,744
Income taxes payable	3,511	3,255
Retirement and deferred compensation plan liabilities	(5,940)	(5,381)
Other changes, net	1,396	2,918
Net Cash Provided by Operations	77,636	51,019
Cash Flows from Investing Activities:
Capital expenditures	(51,742)	(40,019)
Proceeds from sale of property and equipment	178	2,848
Insurance proceeds		10,631
Acquisition of business, release of escrow	(4,036)
Acquisition of intangible assets	(221)	(124)
Proceeds from sale of investment in unconsolidated affiliate	16,487
Notes receivable, net	231	208
Net Cash Used by Investing Activities	(39,103)	(26,456)
Cash Flows from Financing Activities:
Proceeds from notes payable	16,783	8,564
Repayments of notes payable	(21,130)	(3,956)
Proceeds and repayments of short term credit facility, net	(78,222)
Proceeds from long-term obligations	10,446	2,524
Repayments of long-term obligations	(3,227)	(3,855)
Dividends paid	(21,377)	(19,830)
Proceeds from stock option exercises	20,939	34,880
Purchase of treasury stock	(15,000)	(3,905)
Common stock repurchased and retired		(12,797)
Net Cash Provided (Used) by Financing Activities	(90,788)	1,625
Effect of Exchange Rate Changes on Cash	2,809	5,930
Net Increase (Decrease) in Cash and Equivalents and Restricted Cash	(49,446)	32,118
Cash and Equivalents and Restricted Cash at Beginning of Period	266,823	712,640
Cash and Equivalents and Restricted Cash at End of Period	$ 217,377	$ 744,758