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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2013
Cash Dividends Declared | Dividends declared in 2013 and 2012 are as follows:
Dividend per share |  | Date declared |  | Date of record |  | Payment date
$0.025 |  | March 6, 2012 |  | May 1, 2012 |  | May 15, 2012
$0.025 |  | June 13, 2012 |  | August 1, 2012 |  | August 15, 2012
$0.025 |  | July 31, 2012 |  | November 1, 2012 |  | November 15, 2012
$0.025 |  | November 2, 2012 |  | February 1, 2013 |  | February 15, 2013
$0.03125 |  | March 12, 2013 |  | May 1, 2013 |  | May 15, 2013
$0.03125 |  | June 13, 2013 |  | August 1, 2013 |  | August 15, 2013
$0.03125 |  | August 2, 2013 |  | November 1, 2013 |  | November 15, 2013
$0.0375 |  | October 31, 2013 |  | January 31, 2014 |  | February 14, 2014
Summary of Stock Option Activity and Related Information | A summary of the Company’s stock option activity and related information for the three years ended December 31, 2013, is as follows:
|  | Options |  |  | Weighted- average exercise price |  |  | Weighted- average remaining contractual life (years) |  |  | Aggregate intrinsic value |
Options outstanding at December 31, 2010 |  |  | 2,219,200 |  |  | $ | 12.46 |  |  |  |  |  |  |  |  |
Grants |  |  | 391,500 |  |  |  | 11.20 |  |  |  |  |  |  |  |  |
Exercises |  |  | (123,500 | ) |  |  | 5.19 |  |  |  |  |  |  |  |  |
Cancellations |  |  | (11,450 | ) |  |  | 13.29 |  |  |  |  |  |  |  |  |
Options outstanding at December 31, 2011 |  |  | 2,475,750 |  |  |  | 12.62 |  |  |  |  |  |  |  |  |
Grants |  |  | 305,000 |  |  |  | 11.64 |  |  |  |  |  |  |  |  |
Exercises |  |  | (199,823 | ) |  |  | 5.47 |  |  |  |  |  |  |  |  |
Cancellations |  |  | (52,750 | ) |  |  | 12.82 |  |  |  |  |  |  |  |  |
Options outstanding at December 31, 2012 |  |  | 2,528,177 |  |  |  | 13.06 |  |  |  |  |  |  |  |  |
Grants |  |  | 390,800 |  |  |  | 12.26 |  |  |  |  |  |  |  |  |
Exercises |  |  | (247,827 | ) |  |  | 4.91 |  |  |  |  |  |  |  |  |
Cancellations |  |  | (68,000 | ) |  |  | 16.89 |  |  |  |  |  |  |  |  |
Expirations |  |  | (231,500 | ) |  |  | 22.46 |  |  |  |  |  |  |  |  |
Options outstanding at December 31, 2013 |  |  | 2,371,650 |  |  |  | 12.75 |  |  |  | 6.21 |  |  | $ | 10,968,922 |
Options exercisable at December 31, 2013 |  |  | 1,508,350 |  |  | $ | 13.15 |  |  |  | 5.31 |  |  | $ | 7,800,990 |
Fair Value Stock Options at Grant Date using Weighted Average Assumption | The fair values for these stock options were estimated at the dates of grant using the following weighted-average assumptions:
|  | 2013 |  |  | 2012 |  |  | 2011 |
Historical volatility |  |  | 61 | % |  |  | 61 | % |  |  | 60 | %
Expected term (years) |  |  | 5.6 |  |  |  | 6.0 |  |  |  | 5.6 |
Risk-free interest rate |  |  | 0.88 | % |  |  | 1.10 | % |  |  | 1.96 | %
Expected dividend yield |  |  | 0.97 | % |  |  | 0.86 | % |  |  | 0.89 | %

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