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Notes Payable and Long-Term Debt (Details 2) (USD $) | 12 Months Ended |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 denominator numerator | Dec. 31, 2010 | Dec. 31, 2011 6.21% senior notes, due 2012 | Dec. 31, 2010 6.21% senior notes, due 2012 | Dec. 31, 2011 6.92% senior notes, due 2012 | Dec. 31, 2010 6.92% senior notes, due 2012 | Dec. 31, 2011 Industrial Development Revenue Bonds, floating rates (1.27% - 2.10% at December 31, 2011) due 2014 through 2027 | Dec. 31, 2010 Industrial Development Revenue Bonds, floating rates (1.27% - 2.10% at December 31, 2011) due 2014 through 2027 | Dec. 31, 2011 Foreign subsidiary obligation, 5.34%, due 2012 through 2021 | Dec. 31, 2010 Foreign subsidiary obligation, 5.34%, due 2012 through 2021 | Sep. 17, 2010 Foreign subsidiary obligation, 5.34%, due 2012 through 2021 | Dec. 31, 2011 Foreign subsidiary obligation, floating rate | Dec. 31, 2010 Foreign subsidiary obligation, floating rate | Dec. 31, 2011 Capital lease obligations and other | Dec. 31, 2010 Capital lease obligations and other
Notes Payable and Long Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 114,000,000 |  |  |  |
Interest rate (as a percent) |  |  | 6.21% |  | 6.92% |  |  |  |  |  | 5.34% |  |  |  |
Long-term debt | 157,252,000 | 93,104,000 | 1,072,000 | 2,143,000 | 31,000,000 | 31,000,000 | 41,800,000 | 41,800,000 | 81,318,000 | 16,352,000 |  | 206,000 | 221,000 | 1,856,000 | 1,588,000
Floating rates, low end of range (as a percent) |  |  |  |  |  |  | 1.27% |  |  |  |  |  |  |  |
Floating rates, high end of range (as a percent) |  |  |  |  |  |  | 2.10% |  |  |  |  |  |  |  |
Current maturities of long-term debt | (40,885,000) | (1,697,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, less current maturities | 116,367,000 | 91,407,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum consolidated funded debt as a percentage of aggregate capitalization | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator for adjusted leverage ratio, maximum | 3.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator for adjusted leverage ratio, maximum | 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum net worth base requirement | 1,150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated net income added to net worth base amount | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base amount used to calculate maximum dividend allowed | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated net income added to base dividend amount | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated net losses deducted from base dividend amount | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds of capital stock added to base dividend amount | 800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of dividends | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sum of subsidiary indebtedness and priority indebtedness as a percentage of consolidated tangible net worth, maximum | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | 40,885,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 | 8,688,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 16,085,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 8,132,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 8,132,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | $ 75,330,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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