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Capital Stock (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jan. 28, 2013
Equity [Abstract] |  |  |  |
Common stock authorized (in shares) | 150,000,000 |  |  |
Preferred stock authorized (in shares) | 4,000,000 |  |  |
Common stock authorized, par value (in dollars per share) | $ 1.25 | $ 1.25 |  |
Preferred stock authorized, par value (in dollars per share) | $ 1.25 |  |  |
Shares Authorized to Be Purchased [Roll Forward] |  |  |  |
Shares Authorized for Purchased, Beginning Balance | 1,713,423 | 2,000,000 | 2,000,000 |
Additional Shares Authorized for Purchase | 0 | 0 | 0 |
Shares Purchased | 0 | 286,577 | 0 |
Remaining Shares Authorized for Purchase, Ending Balance | 1,713,423 | 1,713,423 | 2,000,000 |
Number of shares authorized to be repurchased |  |  |  | 2,000,000
Preferred Stock Purchase Rights Agreement |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Number of rights distributed for each share of common stock outstanding | 1 |  |  |
Minimum percentage of common stock to be acquired to trigger exercise of rights | 15.00% |  |  |
Number of securities called by rights (in shares) | 0.01 |  |  |
Exercise price of warrant or right (in dollars per share) | 230 |  |  |
Multiplier of exercise price of right to determine common share purchase rights | 2 |  |  |
Redemption price per right (in dollars per share) | $ 0.001 |  |  |
Number of business days following the acquisition of stock after which rights become exercisable | 10 days |  |  |
Preferred stock reserved for issuance upon exercise of rights (in shares) | 805,846 | 804,772 |  |

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