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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash provided by (used for) operations    
Net income $ 49,854 $ 64,268
Items in net income not using (providing) cash    
Depreciation and amortization, including deferred financing costs and other 42,314 39,223
Stock-based compensation 4,330 4,186
Pension expense 2,844 597
Deferred income taxes 20,722 1,913
Other (1,853) (1,609)
Decrease (increase) in working capital    
Receivables (59,381) (61,002)
Inventories (10,154) (15,512)
Prepaid expenses and other (2,241) (1,695)
Accounts payable and accrued liabilities 76,485 62,003
Pension contributions (53,701) (11,675)
Income taxes payable 13,489 14,883
Other (4,782) (7,482)
Net cash provided by (used for) operations 77,926 88,098
Cash provided by (used for) investment    
Expenditures for property and equipment (56,698) (40,860)
Proceeds from sales of assets 2,959 4,767
Net cash provided by (used in) investment (53,739) (36,093)
Cash provided by (used for) financing    
Borrowings of long-term debt, including revolving credit facility 50,000 57,600
Payments on revolving credit facility 0 (57,600)
Treasury stock purchased (23,711) 0
Financing costs (702) (11)
Other (539) (269)
Net cash provided by (used in) financing 25,048 (280)
Net increase (decrease) in cash and cash equivalents 49,235 51,725
Balance at beginning of the period 163,549 118,249
Balance at end of the period $ 212,784 $ 169,974