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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities:      
Net income $ 96,745 $ 251,294 $ 215,804
Adjustments to reconcile net income to net cash provided by operations:      
Depreciation and amortization 140,228 130,257 121,408
Deferred income taxes 61,571 (12,350) 25,034
Stock-based compensation 4,009 13,570 14,919
Change in LIFO reserve 2,981 11,990 (53,108)
Amortization of unrecognized postretirement benefits 42,004 43,058 46,170
Pension settlement charges 0 12,262 0
Changes in operating assets and liabilities:      
Accounts and notes receivable (12,239) (45,674) (15,155)
Inventories (31,820) (77,872) 51,864
Other current assets (34,848) 3,831 (931)
Accounts payable (31,217) 13,128 (42,068)
Accrued liabilities (134) (20,541) 25,712
Other items (60,452) (10,210) (85,342)
Net cash provided by operating activities 176,828 312,743 304,307
Investing activities:      
Additions to property, plant and equipment and capitalized software (197,186) (175,437) (182,544)
Acquisition of business, net of cash acquired 0 (5,928) 0
Proceeds from the sale of assets 278 337 1,651
Net cash used in investing activities (196,908) (181,028) (180,893)
Financing activities:      
Net (payments on) issuances of short-term debt (1,507) 10,019 (41,303)
Repayments of long-term debt (2,421) (935) (3,125)
Payment of financing fees 0 0 (2,586)
Repurchase of common stock (90,868) (107,999) (108,821)
Payments of employee taxes withheld from share-based awards (7,002) (2,948) (3,993)
Payment of dividends to noncontrolling shareholders (282) (804) (917)
Payment of dividends (21,914) (22,828) (23,880)
Issuance of common shares related to stock-based compensation 4,224 3,950 19,642
Excess tax benefits on stock-based compensation 0 274 4,323
Net cash used in financing activities (119,770) (121,271) (160,660)
Effects of exchange rate changes on cash of continuing operations 7,111 (11,178) (9,249)
Changes in cash and cash equivalents (132,739) (734) (46,495)
Cash and cash equivalents at beginning of year 504,423 505,157 551,652
Cash and cash equivalents at end of year $ 371,684 $ 504,423 $ 505,157