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Equity (Details 2) (USD $) |  | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2008 | Dec. 31, 2011 Restricted stock | Dec. 31, 2010 Restricted stock | Dec. 31, 2011 Restricted stock $ 28.70 per share | Jan. 31, 2012 Restricted stock $ 31.77 per share Issuance of shares | Jan. 31, 2012 Restricted stock $ 31.77 per share Issuance of shares Vesting on June 15, 2015 | Jan. 31, 2012 Restricted stock $ 31.77 per share Issuance of shares Vesting on January 10, 2016 | Dec. 31, 2010 Restricted stock $ 25.95 per share | Dec. 31, 2010 Restricted stock $ 25.04 per share | Dec. 31, 2010 Restricted stock $ 26.53 per share | Dec. 31, 2010 Restricted stock $ 26.59 per share | Dec. 31, 2011 Stock Options Y | Dec. 31, 2010 Stock Options Y
Stock Based Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock that have been reserved for awards (in shares) | 600,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  | 6,000 | 208,591 | 6,000 | 14,000 |  |  | 4,000 | 1,000 | 11,030 | 92,900 |  |
Additional shares granted (in shares) |  |  |  |  |  | 30,000 | 12,200 |  |  | 99,661 |  |  |
Price per share |  |  |  | $ 28.70 | $ 31.77 | $ 31.77 | $ 31.77 | $ 25.95 | $ 25.04 | $ 26.53 |  |  |
Vesting period (in years) |  | three-year |  |  | five-year |  |  | three-year | three-year | three-year | five-year |  |
Vesting period of additional shares granted (in years) |  |  |  |  |  |  |  |  |  | five-year |  |  |
Restricted stock activity |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in shares) |  | 217,317 | 84,866 |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 6,000 | 208,591 | 6,000 | 14,000 |  |  | 4,000 | 1,000 | 11,030 | 92,900 |  |
Vested (in shares) |  | (58,183) | (76,140) |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the year (in shares) |  | 165,134 | 217,317 |  |  |  |  |  |  |  |  |  |
Compensation expense for the year |  | $ 1,450,000 | $ 1,210,000 |  |  |  |  |  |  |  |  |  |
Total compensation cost |  | 3,892,000 |  |  |  |  |  |  |  |  |  | 10,000 |
Nonqualified stock option activity |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in shares) |  |  |  |  |  |  |  |  |  |  |  | 185,334 | 197,000
Exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  | (5,000) | (11,666)
Outstanding at the end of the year (in shares) |  |  |  |  |  |  |  |  |  |  |  | 180,334 | 185,334
Exercisable at the end of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 175,334 | 175,334
Weighted Average Price |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 23.34 | $ 22.88
Exercised (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 23.79 | $ 15.62
Outstanding at the end of the year (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 23.33 | $ 23.34
Exercisable at the end of the period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 23.29 | $ 23.27
Aggregate intrinsic value of exercisable options at the end of the year |  |  |  |  |  |  |  |  |  |  |  | 1,327,000 |
Weighted average remaining contractual life of options exercisable (in years) |  |  |  |  |  |  |  |  |  |  |  | 3.5 |
Options Exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  | 5,000 | 11,666
Weighted Average Exercise Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 23.79 | $ 15.62
Stock-based compensation plans, additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |
Option value |  |  |  |  |  |  |  |  |  |  |  | 119,000 | 182,000
Market value |  |  |  |  |  |  |  |  |  |  |  | $ 152,000 | $ 315,000
Weighted average exercise price of the options (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 23.33 | $ 23.34
Weighted average remaining contractual life of options outstanding (in years) |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.1

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