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Operations and Summary of Significant Accounting Policies (Details 2) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 series item | Dec. 31, 2011 | Dec. 31, 2010
Plant Closure |  |  |  |  |  |  |  |  |  |  |
Net book value of the long-lived assets, including land, building and equipment | $ 213,452,000 |  |  |  | $ 195,716,000 |  |  |  | $ 213,452,000 | $ 195,716,000 |
Additional depreciation |  |  |  |  |  |  |  |  | 19,000,000 | 16,300,000 | 16,800,000
Common Stock |  |  |  |  |  |  |  |  |  |  |
Number of votes for each share of common stock held |  |  |  |  |  |  |  |  | 1 |  |
Number of rights per common stock as a part of dividend distribution |  |  |  |  |  |  |  |  | 1 |  |
Percentage acquisition of common stock triggering exercise terms of rights, minimum |  |  |  |  |  |  |  |  | 15.00% |  |
Ownership interest held by any stockholder at date of rights distribution to which additional exercise terms for the Rights distributed apply (as a percent) |  |  |  |  |  |  |  |  | 25.00% |  |
Subsequent increase in ownership interest held by any stockholder after rights distribution to which additional exercise terms for the Rights distributed apply (as a percent) |  |  |  |  |  |  |  |  | 40.00% |  |
Redemption price per right (in cents per right) |  |  |  |  |  |  |  |  | $ 0.01 |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Number of series by which the Board may issue authorized and unissued preferred stock, minimum |  |  |  |  |  |  |  |  | 1 |  |
Preferred stock designated as Series A Participating and reserved for issuance on exercise of the Rights | 1,000,000 |  |  |  |  |  |  |  | 1,000,000 |  |
Number of banks where demand deposit or money market accounts are held by the company |  |  |  |  |  |  |  |  | 10 |  |
Reconciliation of basic earnings per share ("EPS") to diluted EPS |  |  |  |  |  |  |  |  |  |  |
Earnings from continuing operations, net of tax |  |  |  |  | 4,948,000 | 19,380,000 | 19,493,000 | 7,078,000 | 41,918,000 | 50,900,000 | 44,798,000
Loss from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  | (16,212,000)
Net income | 5,883,000 | 12,976,000 | 15,859,000 | 7,201,000 | 4,948,000 | 19,380,000 | 19,493,000 | 7,078,000 | 41,918,000 | 50,900,000 | 28,586,000
Basic weighted average shares outstanding |  |  |  |  |  |  |  |  | 48,339,000 | 48,974,000 | 49,498,000
Dilutive effect of potential common stock equivalents - stock options (in shares) |  |  |  |  |  |  |  |  | 73,000 | 49,000 | 114,000
Diluted weighted average shares outstanding |  |  |  |  |  |  |  |  | 48,412,000 | 49,023,000 | 49,612,000
Earnings per common share - basic: |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.87 | $ 1.04 | $ 0.91
Discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ (0.33)
Net income (in dollars per share) | $ 0.12 | $ 0.27 | $ 0.33 | $ 0.15 | $ 0.10 | $ 0.40 | $ 0.39 | $ 0.14 | $ 0.87 | $ 1.04 | $ 0.58
Earnings per common share - diluted: |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.87 | $ 1.04 | $ 0.90
Discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ (0.33)
Net income (in dollars per share) | $ 0.12 | $ 0.27 | $ 0.33 | $ 0.15 | $ 0.10 | $ 0.40 | $ 0.39 | $ 0.14 | $ 0.87 | $ 1.04 | $ 0.58
Potentially dilutive securities excluded from earnings per diluted share because their effect is anti-dilutive (in shares) |  |  |  |  |  |  |  |  | 1,700,000 | 1,363,000 | 1,018,000
Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Translation adjustments, net of tax | 12,342,000 |  |  |  | 6,783,000 |  |  |  | 12,342,000 | 6,783,000 |
Unamortized pension adjustments, net of tax | (243,000) |  |  |  |  |  |  |  | (243,000) |  |
Total accumulated other comprehensive income | 12,099,000 |  |  |  | 6,783,000 |  |  |  | 12,099,000 | 6,783,000 |
Translation adjustments, tax | 883,000 |  |  |  | 916,000 |  |  |  | 883,000 | 916,000 |
Unamortized pension adjustments, tax benefit |  |  |  |  |  |  |  |  | 46,000 |  |
Concentration of Credit Risk |  |  |  |  |  |  |  |  |  |  |
Number of banks where demand deposit or money market accounts are held by the company |  |  |  |  |  |  |  |  | 10 |  |
Facility closing |  |  |  |  |  |  |  |  |  |  |
Plant Closure |  |  |  |  |  |  |  |  |  |  |
Severance costs |  |  |  |  |  |  |  |  | 3,000,000 |  |
Severance costs paid |  |  |  |  |  |  |  |  | 2,400,000 |  |
Severance costs to be paid in 2013 |  |  |  |  |  |  |  |  | 600,000 |  |
Net book value of the long-lived assets, including land, building and equipment | 2,800,000 |  |  |  |  |  |  |  | 2,800,000 |  |
Additional depreciation |  |  |  |  |  |  |  |  | 200,000 |  |
Plant closing expenses |  |  |  |  |  |  |  |  | 300,000 |  |
Plant closing expenses paid |  |  |  |  |  |  |  |  | 200,000 |  |
Plant closing expenses to be paid in 2013 |  |  |  |  |  |  |  |  | 100,000 |  |
Estimated additional closing costs to be incurred and paid in 2013 |  |  |  |  |  |  |  |  | 400,000 |  |
Amount of assets sold |  |  |  |  |  |  |  |  | 1,600,000 |  |
Facility closing | Cost of sales |  |  |  |  |  |  |  |  |  |  |
Plant Closure |  |  |  |  |  |  |  |  |  |  |
Severance costs |  |  |  |  |  |  |  |  | 2,300,000 |  |
Loss on sale of inventory |  |  |  |  |  |  |  |  | 1,000,000 |  |
Facility closing | Operating expenses |  |  |  |  |  |  |  |  |  |  |
Plant Closure |  |  |  |  |  |  |  |  |  |  |
Severance costs |  |  |  |  |  |  |  |  | 700,000 |  |
Estimated closing costs |  |  |  |  |  |  |  |  | 700,000 |  |
Accelerated amortization |  |  |  |  |  |  |  |  | $ 600,000 |  |

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