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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash provided by (used for) operations    
Net income $ 27,847 $ 31,983
Items in net income not using (providing) cash    
Depreciation and amortization, including deferred financing costs and other 27,638 25,616
Stock-based compensation 2,898 2,310
Pension expense 2,881 357
Deferred income taxes 7,187 2,721
Other (622) (1,729)
Decrease (increase) in working capital    
Receivables (61,885) (65,953)
Inventories (20,653) (27,206)
Prepaid expenses and other (3,375) (3,424)
Accounts payable and accrued liabilities 78,457 58,393
Pension contributions (53,203) (780)
Income taxes payable 14,499 10,993
Other (1,954) (3,956)
Net cash provided by (used for) operations 19,715 29,325
Cash provided by (used for) investment    
Expenditures for property and equipment (31,433) (21,971)
Proceeds from sales of assets 263 4,669
Net cash provided by (used in) investment (31,170) (17,302)
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 (6,109) 0
Financing costs (655) (11)
Other (403) (342)
Net cash provided by (used in) financing 42,833 (353)
Net increase (decrease) in cash and cash equivalents 31,378 11,670
Balance at beginning of the period 163,549 118,249
Balance at end of the period $ 194,927 $ 129,919