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Long Term Debt (Narrative) (Details) (USD $) |  | 3 Months Ended |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2014 U.S. Revolver | Mar. 31, 2014 U.S. Revolver Maximum | Mar. 31, 2014 U.S. Revolver Federal Funds Rate | Mar. 31, 2014 U.S. Revolver Eurocurrency Rate | Mar. 31, 2014 Canadian Revolver | Mar. 31, 2014 Canadian Revolver Maximum | Mar. 31, 2014 Canadian Revolver Minimum | Mar. 31, 2014 Industrial Development Revenue Bonds | Oct. 31, 2001 Industrial Development Revenue Bonds
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  | $ 75,000,000 |  |  |  |  |  |  |  |
Revolving credit interest rate |  | The interest rate for amounts outstanding under the Amended Credit Agreement for the U.S. Revolver is a floating rate based upon the higher of the Federal Funds Rate plus 0.5%, the bank’s prime rate, or the Eurocurrency rate plus 1.00%. |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.50% | 1.00% |  |  |  |  |
Margin |  |  | 1.75% |  |  |  | 1.75% | 0.50% |  |
Outstanding letters of credit |  | 21,900,000 |  |  |  | 100,000 |  |  |  |
Amount of credit facility remaining borrowing capacity |  | 53,100,000 |  |  |  | 8,900,000 |  |  |  |
Credit facility expiration date |  | Dec. 31, 2018 |  |  |  | Feb. 28, 2015 |  |  |  |
Percentage of voting capital stock pledged as collateral |  | 100.00% |  |  |  |  |  |  |  |
Non-domestic subsidiaries of voting capital stock |  | 66.00% |  |  |  |  |  |  |  |
Revolving credit facility, current borrowing capacity |  |  |  |  |  | 9,000,000 |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  | 8,000,000
Reimbursement agreement requires annual redemptions |  |  |  |  |  |  |  |  | 400,000 |
Balance in the restricted sinking fund | $ 200,000 |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 0.25% |

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