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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Exercise of stock options | 682,263 | 586,563 | 113,359
Purchase of treasury stock | 97,430 | 36,553 | 83,802
Preferred stock dividend shares | $ 63.80 | $ 63.80 | $ 63.80
Treasury Stock [Member] |  |  |
Purchase of treasury stock | 97,430 | 36,553 | 83,802
Additional Paid-in Capital [Member] |  |  |
Exercise of stock options | 682,263 | 586,563 | 113,359
Accumulated Deficit [Member] |  |  |
Preferred stock dividend shares | $ 63.80 | $ 63.80 | $ 63.80

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