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Equity (Details 2) (USD $) | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2008 | Dec. 31, 2012 Stock Options | Dec. 31, 2011 Stock Options | Dec. 31, 2012 Restricted stock | Dec. 31, 2011 Restricted stock | Dec. 31, 2012 Restricted stock $ 31.87 per share Vesting ratably over three-year period from the grant date | Dec. 31, 2012 Restricted stock $ 31.77 per share Vesting on June 15, 2015 | Dec. 31, 2012 Restricted stock $ 31.77 per share Vesting on January 10, 2016 | Dec. 31, 2012 Restricted stock $ 31.77 per share Vesting ratably over five-year period from the grant date | Dec. 31, 2011 Restricted stock $ 28.70 per share Vesting ratably over three-year period from the grant date | Jan. 31, 2013 Restricted stock $ 36.26 per share Subsequent Event | Jan. 31, 2013 Restricted stock $ 36.26 per share Subsequent Event Vesting on June 1, 2016 | Dec. 31, 2012 Restricted stock $ 34.90 per share Vesting ratably over five-year period from the grant date | Dec. 31, 2012 Restricted stock $ 34.90 per share Vesting on December 20, 2015
Stock Based Compensation Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock that have been reserved for awards (in shares) |  | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  |  | $ 1,809,000 | $ 1,450,000 |  |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  |  |  |  |  |  |  |  |  |  | 6,000 | 20,000 | 20,000 |  |
Price per share |  |  |  |  |  |  | $ 31.87 | $ 31.77 | $ 31.77 | $ 31.77 | $ 28.70 | $ 36.26 | $ 36.26 | $ 34.90 | $ 34.90
Vesting period |  |  |  |  |  |  | 3 years |  |  | 5 years | 3 years |  |  | 5 years |
Restricted stock activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in shares) |  |  |  |  | 165,134 | 217,317 |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 90,500 | 6,000 | 8,000 | 30,000 | 12,200 | 14,000 |  |  |  | 6,300 | 20,000
Vested (in shares) |  |  |  |  | (60,185) | (58,183) |  |  |  |  |  |  |  |  |
Outstanding at the end of the year (in shares) |  |  |  |  | 195,449 | 165,134 |  |  |  |  |  |  |  |  |
Total compensation cost |  |  |  |  | 5,041,000 |  |  |  |  |  |  |  |  |  |
Nonqualified stock option activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in shares) |  |  | 180,334 | 185,334 |  |  |  |  |  |  |  |  |  |  |
Exercised (in shares) | (85,000) |  | (85,000) | (5,000) |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the year (in shares) |  |  | 95,334 | 180,334 |  |  |  |  |  |  |  |  |  |  |
Exercisable at the end of the period (in shares) |  |  | 95,334 | 175,334 |  |  |  |  |  |  |  |  |  |  |
Weighted Average Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the year (in dollars per share) |  |  | $ 23.33 | $ 23.34 |  |  |  |  |  |  |  |  |  |  |
Exercised (in dollars per share) |  |  | $ 22.66 | $ 23.79 |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the year (in dollars per share) |  |  | $ 23.93 | $ 23.33 |  |  |  |  |  |  |  |  |  |  |
Exercisable at the end of the period (in dollars per share) |  |  | $ 23.93 | $ 23.29 |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of exercisable options at the end of the year |  |  | 1,074,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of options exercisable |  |  | 3 years 10 months 24 days |  |  |  |  |  |  |  |  |  |  |  |
Options Exercised (in shares) | 85,000 |  | 85,000 | 5,000 |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price (in dollars per share) |  |  | $ 22.66 | $ 23.79 |  |  |  |  |  |  |  |  |  |  |
Option value |  |  | 1,926,000 | 119,000 |  |  |  |  |  |  |  |  |  |  |
Market value |  |  | $ 2,761,000 | $ 152,000 |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price of the options (in dollars per share) |  |  | $ 23.93 | $ 23.33 |  |  |  |  |  |  |  |  |  |  |

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