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CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Accounts receivable, allowance for doubtful accounts | $ 906 | $ 476 |
| Property, plant and equipment, accumulated depreciation | $ 221,200 | $ 225,092 |
| Capital Stock, par value (in dollars per share) | $ 1 | $ 1 |
| Capital Stock, authorized shares (shares) | 50,000,000 | 50,000,000 |
| Capital Stock, shares outstanding (shares) | 18,605,116 | 18,403,109 |