CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities:
Net income	$ 136,920	$ 115,069
Adjustments to reconcile net income to net cash provided by operations:
Depreciation	82,968	75,703
Amortization	12,388	5,573
Stock based compensation	12,978	10,903
Provision for (recovery of) doubtful accounts	312	196
(Gain) loss on disposition of fixed assets	368	(1,036)
Deferred income taxes	679	(4,027)
Defined benefit plan expense	7,699	9,688
Equity in results of affiliates	86	85
Changes in balance sheet items, excluding effects from acquisitions and foreign currency adjustments:
Accounts and other receivables	(28,772)	(92,388)
Inventories	(18,503)	(30,787)
Prepaid and other current assets	546	4,038
Accounts payable and accrued liabilities	14,590	61,727
Income taxes payable	1,840	10,541
Retirement and deferred compensation plan liabilities	(4,652)	(3,356)
Other changes, net	1,693	(7,420)
Net Cash Provided by Operations	221,140	154,509
Cash Flows from Investing Activities:
Capital expenditures	(124,774)	(91,753)
Proceeds from sale of property, plant and equipment	1,082	3,961
Insurance proceeds		10,631
Acquisition of business, net of cash acquired	(49,131)	(3,510)
Acquisition of intangible assets	(602)	(124)
Investment in equity securities		(10,000)
Proceeds from sale of investment in equity securities	16,487
Notes receivable, net	(220)	109
Net Cash Used by Investing Activities	(157,158)	(90,686)
Cash Flows from Financing Activities:
Proceeds from notes payable	31,022	8,815
Repayments of notes payable	(35,490)	(5,256)
Proceeds and repayments of short term credit facility, net	(38,685)
Proceeds from long-term obligations	10,446	4,617
Repayments of long-term obligations	(6,546)	(5,403)
Dividends paid	(44,138)	(39,810)
Proceeds from stock option exercises	70,712	46,420
Purchase of treasury stock	(19,096)	(3,905)
Common stock repurchased and retired		(57,787)
Net Cash Provided (Used) by Financing Activities	(31,775)	(52,309)
Effect of Exchange Rate Changes on Cash	3,920	(6,063)
Net Increase (Decrease) in Cash and Equivalents and Restricted Cash	36,127	5,451
Cash and Equivalents and Restricted Cash at Beginning of Period	266,823	712,640
Cash and Equivalents and Restricted Cash at End of Period	$ 302,950	$ 718,091