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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash provided by (used for) operations      
Net Income $ 52,182 $ 80,009 $ 116,936
Items in net income not using (providing) cash      
Depreciation and amortization, including deferred financing costs and other 57,197 53,052 39,810
Stock-based compensation 5,825 5,916 2,869
Pension expense 2,825 838 10,989
Deferred income taxes 30,883 10,705 (59,600)
Other (1,837) (1,589) (789)
Decrease (increase) in working capital, net of acquisitions      
Receivables (18,182) (20,277) (11,014)
Inventories 9,604 (11,102) (50,958)
Prepaid expenses and other (985) 143 (515)
Accounts payable and accrued liabilities 6,822 15,418 1,151
Pension contributions (54,257) (12,071) (10,739)
Income taxes payable (2,589) (7,766) (2,016)
Other (7,157) (11,433) (2,697)
Net cash provided by operations 80,331 101,843 33,427
Cash provided by (used for) investment      
Expenditures for property and equipment (87,526) (61,217) (45,751)
Acquisitions of businesses and facilities 0 0 (103,029)
Proceeds from sales of assets and other 3,134 4,813 2,100
Net cash used for investment (84,392) (56,404) (146,680)
Cash provided by (used for) financing      
Borrowings of long-term debt, including revolving credit facility 50,000 57,600 130,000
Payments of long-term debt, including revolving credit facility 0 (57,600) (105,010)
Treasury stock purchased (23,711) 0 (100,000)
Net proceeds from issuance of common stock 0 0 262,488
Financing costs (702) (11) (2,061)
Other (579) (128) 192
Net cash provided by (used for) financing 25,008 (139) 185,609
Net increase (decrease) in cash and cash equivalents 20,947 45,300 72,356
Balance at beginning of the period 163,549 118,249 45,893
Balance at end of the period $ 184,496 $ 163,549 $ 118,249