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Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
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 and nine month periods ended September 30, 2015 and 2014 follow:
| Three Months Ended |  |  | Nine Months Ended |
| September 30, |  |  | September 30, |
| 2015 |  | 2014 |  |  | 2015 |  |  | 2014 |
Volatility | NA |  |  | 35.64% |  |  |  | 37.95 | % |  |  | 35.89 | %
Expected term (in years) | NA |  |  | 5.00 |  |  |  | 5.00 |  |  |  | 5.00 |
Dividend yield | NA |  |  | 1.18% |  |  |  | 2.00 | % |  |  | 1.17 | %
Risk-free interest rate | NA |  |  | 1.62% |  |  |  | 1.37 | % |  |  | 1.76 | %
Stock Option Activity | Stock option activity from January 1, 2015 to September 30, 2015 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
| Underlying |  |  | Exercise |
| Shares |  |  | Price |
Outstanding at January 1, 2015 |  | 6,086,250 |  |  | $ | 22.32 |
Granted |  | 831,000 |  |  | $ | 20.06 |
Exercised |  | — |  |  |  | — |
Cancelled |  | (10,000 | ) |  | $ | 16.59 |
Expired |  | (600,000 | ) |  | $ | 26.06 |
Outstanding at September 30, 2015 |  | 6,307,250 |  |  | $ | 21.68 |
Exercisable at September 30, 2015 |  | 5,134,697 |  |  | $ | 21.39 |
Restricted Stock Activity | Restricted stock activity from January 1, 2015 to September 30, 2015 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
|  |  |  |  | Grant Date |
| Shares |  |  | Fair Value |
Non-vested restricted stock outstanding at January 1, 2015 |  | 1,493,059 |  |  | $ | 26.93 |
Granted |  | 792,100 |  |  | $ | 20.60 |
Vested |  | (728,400 | ) |  | $ | 24.74 |
Forfeited |  | (65,853 | ) |  | $ | 26.22 |
Non-vested restricted stock outstanding September 30, 2015 |  | 1,490,906 |  |  | $ | 24.67 |
Restricted Stock Unit Activity | Restricted stock unit activity from January 1, 2015 to September 30, 2015 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
|  |  |  |  | Grant Date |
| Shares |  |  | Fair Value |
Non-vested restricted stock units outstanding at January 1, 2015 |  | 34,085 |  |  | $ | 30.20 |
Granted |  | 22,100 |  |  | $ | 20.85 |
Vested |  | (14,499 | ) |  | $ | 27.37 |
Forfeited |  | — |  |  |  | — |
Non-vested restricted stock units outstanding September 30, 2015 |  | 41,686 |  |  | $ | 26.22 |
Stock-Settled Performance Units | The total target number of shares with respect to the Stock-Settled Performance Units is set forth below:
| 2015 |  |  | 2014 |  |  | 2013 |  |  | 2012 |  |  | 2011 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Target number of shares |  | 190,600 |  |  |  | 154,000 |  |  |  | 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):
| 2015 |  |  | 2014 |  |  | 2013 |  |  | 2012 |  |  | 2011 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Fair value at date of grant | $ | 4,052 |  |  | $ | 5,388 |  |  | $ | 5,564 |  |  | $ | 3,065 |  |  | $ | 5,569 |
Compensation Expense Associated with Stock-Settled Performance Units | These fair value amounts are charged to expense on a straight-line basis over the performance period. Compensation expense associated with the Stock-Settled Performance Units is shown below (in thousands):
| 2015 |  |  | 2014 |  |  | 2013 |  |  | 2012 |  |  | 2011 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Three months ended September 30, 2014 | NA |  |  | $ | 449 |  |  | $ | 464 |  |  | $ | 255 |  |  | NA |
Three months ended September 30, 2015 | $ | 338 |  |  | $ | 449 |  |  | $ | 464 |  |  | NA |  |  | NA |
Nine months ended September 30, 2014 | NA |  |  | $ | 898 |  |  | $ | 1,391 |  |  | $ | 766 |  |  | $ | 464 |
Nine months ended September 30, 2015 | $ | 675 |  |  | $ | 1,347 |  |  | $ | 1,391 |  |  | $ | 255 |  |  | NA |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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