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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash provided by (used for) operations      
Net Income $ 82,957 $ 38,254 $ 52,182
Items in net income not using (providing) cash      
Depreciation and amortization, including deferred financing costs and other 82,321 74,927 57,197
Stock-based compensation 9,730 8,177 5,825
Pension expense 1,464 6,240 2,825
Deferred income taxes 8,117 (7,823) 30,883
Change in fair value of interest rate swaps (538) (4,210) 0
Other 376 491 (1,837)
Loss on extinguishment of debt 0 14,304 0
Decrease (increase) in working capital, net of acquisitions      
Receivables (41,778) (1,118) (18,182)
Inventories (43,222) (30,757) 9,604
Prepaid expenses and other (887) (1,614) (985)
Accounts payable and accrued liabilities 68,124 45,651 6,822
Pension contributions (2,193) (3,844) (54,257)
Income taxes payable (14,292) 6,385 (2,589)
Other 1,388 6,844 (7,157)
Net cash provided by operations 151,567 151,907 80,331
Cash provided by (used for) investment      
Expenditures for property and equipment (75,450) (83,583) (87,526)
Acquisitions of businesses and facilities 0 (215,900) 0
Proceeds from sales of assets and other 2,238 644 3,134
Net cash used for investment (73,212) (298,839) (84,392)
Cash provided by (used for) financing      
Borrowings of long-term debt, including revolving credit facility 410,400 837,800 50,000
Payments of long-term debt, including revolving credit facility (410,400) (754,071) 0
Treasury stock purchased 0 (10,268) (23,711)
Financing costs (478) (6,422) (702)
Tax withholding payments for stock-based awards (2,902) (383) (1,160)
Proceeds from exercise of stock options 1,144 0 237
Dividends paid on common stock (2,701) 0 0
Other (256) (242) 344
Net cash provided by (used for) financing (5,193) 66,414 25,008
Net increase (decrease) in cash and cash equivalents 73,162 (80,518) 20,947
Balance at beginning of the period 103,978 184,496 163,549
Balance at end of the period $ 177,140 $ 103,978 $ 184,496