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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Schedule of Dividend Declared | During 2017, 2016 and 2015, our Board declared the following quarterly cash dividends on our common stock:
Dividend Per Share |  | Record Date |  | Payment Date
$0.075 |  | August 7, 2017 |  | September 29, 2017
$0.075 |  | May 10, 2017 |  | June 30, 2017
$0.075 |  | March 6, 2017 |  | March 31, 2017
$0.066 |  | December 16, 2016 |  | December 30, 2016
$0.066 |  | September 16, 2016 |  | September 30, 2016
$0.066 |  | June 18, 2016 |  | June 30, 2016
$0.066 |  | March 18, 2016 |  | March 31, 2016
$0.066 |  | December 16, 2015 |  | December 30, 2015
$0.066 |  | September 18, 2015 |  | September 30, 2015
$0.066 |  | June 12, 2015 |  | June 26, 2015
$0.066 |  | March 19, 2015 |  | March 31, 2015
Summary of Stock Option | Information related to all stock options under the 2017 Plan, 2007 Plan and 1997 Plan for the years ended December 31, 2017, 2016 and 2015 is shown in the tables below:
(Shares in thousands) |  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value ($000) |
Outstanding at December 31, 2016 |  |  | 1,519 |  |  |  | 10.25 |  |  | 6.1 years |  |  |  |
Granted |  |  | 128 |  |  |  | 9.24 |  |  |  |  |  |  |
Forfeitures |  |  | (700 | ) |  |  | 12.44 |  |  |  |  |  |  |
Exercised |  |  | (292 | ) |  |  | 3.92 |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 655 |  |  |  | 10.53 |  |  | 6.0 years |  | $ | 78 |
Exercisable at December 31, 2017 |  |  | 463 |  |  |  | 10.49 |  |  | 5.2 years |  | $ | 78 |
(Shares in thousands) |  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value ($000) |
Outstanding at December 31, 2015 |  |  | 1,877 |  |  | $ | 10.30 |  |  | 6.8 years |  |  |  |
Granted |  |  | 105 |  |  |  | 7.36 |  |  |  |  |  |  |
Forfeitures |  |  | (268 | ) |  |  | 11.91 |  |  |  |  |  |  |
Exercised |  |  | (195 | ) |  |  | 6.90 |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 1,519 |  |  |  | 10.25 |  |  | 6.1 years |  | $ | 5,816 |
Exercisable at December 31, 2016 |  |  | 959 |  |  |  | 9.23 |  |  | 5.3 years |  | $ | 4,608 |
(Shares in thousands) |  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value ($000) |
Outstanding at December 31, 2014 |  |  | 1,727 |  |  | $ | 10.12 |  |  | 7.3 years |  |  |  |
Granted |  |  | 286 |  |  |  | 11.55 |  |  |  |  |  |  |
Forfeitures |  |  | (106 | ) |  |  | 12.31 |  |  |  |  |  |  |
Exercised |  |  | (30 | ) |  |  | 4.47 |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 1,877 |  |  |  | 10.30 |  |  | 6.8 years |  | $ | 1,769 |
Exercisable at December 31, 2015 |  |  | 977 |  |  |  | 8.48 |  |  | 5.4 years |  | $ | 1,765 |
Summary of Restricted Stock Awards | Information related to all restricted stock awards under the 2017 Plan and 2007 Plan for the year ended December 31, 2017 is shown in the table below. The fair value of restricted stock awards is based on the price of the stock in the open market on the date of the grant. The fair value of the restricted stock awards is recorded as compensation expense on a straight-line basis over the vesting periods of the awards and account for forfeitures when they occur.
(Shares in thousands) |  | Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested at December 31, 2016 |  |  | 509 |  |  | $ | 9.64 |
Granted |  |  | 405 |  |  |  | 9.88 |
Vested |  |  | (92 | ) |  |  | 9.78 |
Forfeited |  |  | (268 | ) |  |  | 9.70 |
Nonvested at December 31, 2017 |  |  | 554 |  |  |  | 9.75 |

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