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Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2014
Weighted-Average Assumptions Used to Estimate Grant Date Fair Values for Stock Options Granted | Weighted-average assumptions used to estimate the grant date fair values for stock options granted for the three month periods ended March 31, 2014 and 2013 follow:
|  | Three Months Ended March 31, |
|  | 2014 |  |  | 2013 |
Volatility |  |  | 35.91 | % |  |  | 46.19 | %
Expected term (in years) |  |  | 5.00 |  |  |  | 5.00 |
Dividend yield |  |  | 0.79 | % |  |  | 1.07 | %
Risk-free interest rate |  |  | 1.75 | % |  |  | 0.72 | %
Stock Option Activity | Stock option activity from January 1, 2014 to March 31, 2014 follows:
|  | Underlying Shares |  |  | Weighted Average Exercise Price |
Outstanding at January 1, 2014 |  |  | 7,319,695 |  |  | $ | 21.23 |
Granted |  |  | 50,000 |  |  | $ | 25.32 |
Exercised |  |  | (482,500 | ) |  | $ | 16.65 |
Cancelled |  |  | — |  |  |  | — |
Expired |  |  | — |  |  |  | — |
Outstanding at March 31, 2014 |  |  | 6,887,195 |  |  | $ | 21.58 |
Exercisable at March 31, 2014 |  |  | 5,913,737 |  |  | $ | 21.64 |
Restricted Stock Activity | Restricted stock activity from January 1, 2014 to March 31, 2014 follows:
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Non-vested restricted stock outstanding at January 1, 2014 |  |  | 1,496,692 |  |  | $ | 20.84 |
Granted |  |  | 15,000 |  |  | $ | 25.32 |
Vested |  |  | (52,752 | ) |  | $ | 23.08 |
Forfeited |  |  | (12,757 | ) |  | $ | 19.95 |
Non-vested restricted stock outstanding at March 31, 2014 |  |  | 1,446,183 |  |  | $ | 20.82 |
Restricted Stock Unit Activity | Restricted stock unit activity from January 1, 2014 to March 31, 2014 follows:
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Non-vested restricted stock units outstanding at January 1, 2013 |  |  | 20,256 |  |  | $ | 20.67 |
Granted |  |  | — |  |  |  | — |
Vested |  |  | — |  |  |  | — |
Forfeited |  |  | — |  |  |  | — |
Non-vested restricted stock units outstanding at March 31, 2014 |  |  | 20,256 |  |  | $ | 20.67 |
Stock-Settled Performance Units | The total target number of shares with respect to the Stock-Settled Performance Units is set forth below:
|  | 2013 Performance Unit Awards |  |  | 2012 Performance Unit Awards |  |  | 2011 Performance Unit Awards |
Target number of shares |  |  | 236,500 |  |  |  | 192,000 |  |  |  | 144,375 |
Fair Value of Stock-Settled Performance Units | The fair value of the Stock-Settled Performance Units is set forth below (in thousands):
|  | 2013 Performance Unit Awards |  |  | 2012 Performance Unit Awards |  |  | 2011 Performance Unit Awards |
Fair value at date of grant |  | $ | 5,564 |  |  | $ | 3,065 |  |  | $ | 5,569 |
Compensation Expense Associated with Stock-Settled Performance Units | Compensation expense associated with the Stock-Settled Performance Units is shown below (in thousands):
|  | 2013 Performance Unit Awards |  |  | 2012 Performance Unit Awards |  |  | 2011 Performance Unit Awards |
Three months ended March 31, 2014 |  | $ | 464 |  |  | $ | 255 |  |  | $ | 464 |
Three months ended March 31, 2013 |  |  | NA |  |  | $ | 255 |  |  | $ | 464 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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