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Equity (Details 3) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Restricted stock activity |  |  |  |
Granted (in shares) |  |  | 92,150 |
Equity Participation Plan 2015 [Member] |  |  |  |
Stock Based Compensation Plans |  |  |  |
Number of shares of common stock that have been reserved for awards (in shares) | 1,400,000 |  | 1,400,000 |
Options granted (in shares) |  |  | 0 |
Equity Participation Plan 2008 [Member] |  |  |  |
Restricted stock activity |  |  |  |
Granted (in shares) |  |  |  | 87,500
Equity Participation Plan 2008 [Member] | Grant Date Price 42.30 [Member] | Vesting Date 2 June 2016 [Member] |  |  |  |
Restricted stock activity |  |  |  |
Granted (in shares) |  |  | 8,400 |
Price per share |  |  | $ 42.30 |
Employee Stock Option [Member] |  |  |  |
Stock Based Compensation Plans |  |  |  |
Vesting period |  |  |  | 3 years
Option exercised (in shares) |  |  | 3,333 | 11,666
Weighted Average Exercise Price (in dollars per share) |  |  | $ 23.79 | $ 23.79
Value of options exercised | $ 79,000 | $ 277,000 | $ 79,000 | $ 277,000
Market value of options on the date of exercise | $ 140,000 | 455,000 | $ 140,000 | 455,000
Options outstanding at end of the period (in shares) | 40,001 |  | 40,001 |
Options exercisable at end of the period (in shares) | 30,001 |  | 30,001 |
Compensation expense related to the vesting of stock awards | $ 4,000 | 4,000 | $ 8,000 | $ 5,000
Remaining compensation expense to be recognized related to the future service period |  |  |  |
Options scheduled to vest (in shares) | 10,000 |  | 10,000 |
Remaining compensation expense | $ 25,000 |  | $ 25,000 |
Employee Stock Option [Member] | Vesting Through December 31 2015 [Member] |  |  |  |
Remaining compensation expense to be recognized related to the future service period |  |  |  |
Remaining compensation expense | $ 7,000 |  | $ 7,000 |
Employee Stock Option [Member] | Vesting Through December 31 2016 [Member] |  |  |  |
Remaining compensation expense to be recognized related to the future service period |  |  |  |
Options scheduled to vest (in shares) | 5,000 |  | 5,000 |
Remaining compensation expense | $ 15,000 |  | $ 15,000 |
Employee Stock Option [Member] | Vesting Through December 31 2017 [Member] |  |  |  |
Remaining compensation expense to be recognized related to the future service period |  |  |  |
Options scheduled to vest (in shares) | 5,000 |  | 5,000 |
Remaining compensation expense | $ 3,000 |  | $ 3,000 |
Employee Stock Option [Member] | Equity Participation Plan 2008 [Member] |  |  |  |
Stock Based Compensation Plans |  |  |  |
Options granted (in shares) |  |  |  | 15,000
Options granted (in dollars per share) |  |  |  | $ 38.43
Restricted Stock [Member] |  |  |  |
Stock Based Compensation Plans |  |  |  |
Compensation expense related to the vesting of stock awards | $ 1,095,000 | $ 779,000 | $ 2,073,000 | $ 1,444,000
Remaining compensation expense to be recognized related to the future service period |  |  |  |
Restricted common stock scheduled to vest (in shares) | 228,547 |  | 228,547 |
Remaining compensation expense | $ 6,140,000 |  | $ 6,140,000 |
Restricted Stock [Member] | Vesting Through December 31 2015 [Member] |  |  |  |
Remaining compensation expense to be recognized related to the future service period |  |  |  |
Restricted common stock scheduled to vest (in shares) | 41,200 |  | 41,200 |
Remaining compensation expense | $ 1,919,000 |  | $ 1,919,000 |
Restricted Stock [Member] | Vesting Through December 31 2016 [Member] |  |  |  |
Remaining compensation expense to be recognized related to the future service period |  |  |  |
Restricted common stock scheduled to vest (in shares) | 102,060 |  | 102,060 |
Remaining compensation expense | $ 2,618,000 |  | $ 2,618,000 |
Restricted Stock [Member] | Vesting Through December 31 2017 [Member] |  |  |  |
Remaining compensation expense to be recognized related to the future service period |  |  |  |
Restricted common stock scheduled to vest (in shares) | 57,367 |  | 57,367 |
Remaining compensation expense | $ 1,416,000 |  | $ 1,416,000 |
Restricted Stock [Member] | Vesting Through December 31, 2018 [Member] |  |  |  |
Remaining compensation expense to be recognized related to the future service period |  |  |  |
Restricted common stock scheduled to vest (in shares) | 27,920 |  | 27,920 |
Remaining compensation expense | $ 187,000 |  | $ 187,000 |
Restricted Stock [Member] | Equity Participation Plan 2015 [Member] |  |  |  |
Restricted stock activity |  |  |  |
Granted (in shares) |  |  | 0 |
Restricted Stock [Member] | Equity Participation Plan 2008 [Member] |  |  |  |
Restricted stock activity |  |  |  |
Number of shares cancelled (in shares) |  |  | 640 |
Granted (in shares) |  |  |  | 87,500
Restricted Stock [Member] | Equity Participation Plan 2008 [Member] | Grant Date Price 44.45 [Member] | Vesting over Three Year Period from Grant Date [Member] |  |  |  |
Stock Based Compensation Plans |  |  |  |
Vesting period |  |  | 3 years |
Restricted stock activity |  |  |  |
Granted (in shares) |  |  | 65,750 |
Price per share |  |  | $ 44.45 |
Restricted Stock [Member] | Equity Participation Plan 2008 [Member] | Grant Date Price 42.30 [Member] | Vesting over Three Year Period from Grant Date [Member] |  |  |  |
Stock Based Compensation Plans |  |  |  |
Vesting period |  |  | 3 years |
Restricted stock activity |  |  |  |
Granted (in shares) |  |  | 18,000 |
Price per share |  |  | $ 42.30 |
Restricted Stock [Member] | Equity Participation Plan 2008 [Member] | Grant Date Price 36.81 [Member] | Vesting over Three Year Period from Grant Date [Member] |  |  |  |
Stock Based Compensation Plans |  |  |  |
Vesting period |  |  |  | 3 years
Restricted stock activity |  |  |  |
Granted (in shares) |  |  |  | 59,000
Price per share |  |  |  | $ 36.81
Restricted Stock [Member] | Equity Participation Plan 2008 [Member] | Grant Date Price 38.43 [Member] | Vesting over Three Year Period from Grant Date [Member] |  |  |  |
Stock Based Compensation Plans |  |  |  |
Vesting period |  |  |  | 3 years
Restricted stock activity |  |  |  |
Granted (in shares) |  |  |  | 3,000
Price per share |  |  |  | $ 38.43
Restricted Stock [Member] | Equity Participation Plan 2008 [Member] | Grant Date Price 40.05[Member] | Vesting over Three Year Period from Grant Date [Member] |  |  |  |
Stock Based Compensation Plans |  |  |  |
Vesting period |  |  |  | 3 years
Restricted stock activity |  |  |  |
Granted (in shares) |  |  |  | 15,000
Price per share |  |  |  | $ 40.05
Restricted Stock [Member] | Equity Participation Plan 2008 [Member] | Grant Date Price 40.05[Member] | Vesting Date 9 June2015 [Member] |  |  |  |
Restricted stock activity |  |  |  |
Granted (in shares) |  |  |  | 10,500
Price per share |  |  |  | $ 40.05

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