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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Company's Option Activity | A summary of the Company’s option activity and related information for the three years ended December 31, 2014 is as follows:
|  | Number of options |  |  | Weighted- average price |  |  | Weighted- average remaining contractual term (in years) |  |  | Aggregate intrinsic value (in millions) |
Balance at December 31, 2011 |  |  | 3,086,019 |  |  | $ | 23.52 |  |  |  |  |  |  |  |  |
Options granted |  |  | 128,500 |  |  |  | 29.63 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (327,498 | ) |  |  | 17.95 |  |  |  |  |  |  |  |  |
Options cancelled/forfeited/expired |  |  | (48,468 | ) |  |  | 27.63 |  |  |  |  |  |  |  |  |
Balance at December 31, 2012 |  |  | 2,838,553 |  |  |  | 24.37 |  |  |  |  |  |  |  |  |
Options granted |  |  | 192,800 |  |  |  | 29.14 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (1,237,341 | ) |  |  | 24.71 |  |  |  |  |  |  |  |  |
Options cancelled/forfeited/expired |  |  | (21,950 | ) |  |  | 25.20 |  |  |  |  |  |  |  |  |
Balance at December 31, 2013 |  |  | 1,772,062 |  |  |  | 24.68 |  |  |  |  |  |  |  |  |
Options granted |  |  | 203,600 |  |  |  | 32.79 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (612,682 | ) |  |  | 21.55 |  |  |  |  |  |  |  |  |
Options cancelled/forfeited/expired |  |  | (19,220 | ) |  |  | 30.35 |  |  |  |  |  |  |  |  |
Balance at December 31, 2014 |  |  | 1,343,760 |  |  | $ | 27.25 |  |  |  | 2.97 |  |  | $ | 11.6 |
Exercisable at December 31, 2014 |  |  | 883,605 |  |  | $ | 25.37 |  |  |  | 1.80 |  |  | $ | 9.3 |
Expected to vest after December 31, 2014 |  |  | 414,140 |  |  | $ | 30.68 |  |  |  | 5.22 |  |  | $ | 2.1 |
Options Outstanding and Options Exercisable by Exercise Price with Weighted-Average Remaining Contractual Life for Options Outstanding and Weighted-Average Exercise Price | The following table indicates the options outstanding and options exercisable by exercise price with the weighted-average remaining contractual life for the options outstanding and the weighted-average exercise price at December 31, 2014:
|  | Options Outstanding |  |  | Options Exercisable |
Exercise price |  | Number outstanding at December 31, 2014 |  |  | Weighted- average remaining contractual life (Years) |  |  | Weighted- average grant date value |  |  | Number exercisable at December 31, 2014 |  |  | Weighted- average grant date value |
$15–20 |  |  | 149,700 |  |  |  | 1.17 |  |  | $ | 15.62 |  |  |  | 149,700 |  |  | $ | 15.62 |
20–25 |  |  | 229,225 |  |  |  | 1.79 |  |  |  | 23.19 |  |  |  | 212,040 |  |  |  | 23.18 |
25–30 |  |  | 653,435 |  |  |  | 2.56 |  |  |  | 29.12 |  |  |  | 510,465 |  |  |  | 29.24 |
30–35 |  |  | 302,000 |  |  |  | 5.56 |  |  |  | 32.35 |  |  |  | 10,400 |  |  |  | 32.40 |
35–40 |  |  | 9,400 |  |  |  | 5.96 |  |  |  | 37.83 |  |  |  | 1,000 |  |  |  | 38.89 |
$15–40 |  |  | 1,343,760 |  |  |  | 2.97 |  |  | $ | 27.25 |  |  |  | 883,605 |  |  | $ | 25.37 |
Schedule of Weighted-Average Assumptions Used to Determine Fair Value of Option Granted | The fair value of each option granted was estimated on the date of grant using the Black-Scholes option-pricing model using the following weighted-average assumptions:
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Expected term (in years) |  |  | 5.0 |  |  |  | 5.0 |  |  |  | 5.0 |
Expected volatility |  |  | 40.5 | % |  |  | 50.3 | % |  |  | 52.1 | %
Expected dividend yields |  |  | 3.0 | % |  |  | 3.3 | % |  |  | 3.2 | %
Risk-free interest rates |  |  | 1.5 | % |  |  | 0.8 | % |  |  | 0.8 | %
Summary of Company's Restricted Stock Units Activity | The following table summarizes the activity of the Company’s RSUs, which includes service-based and performance-based awards, for the three years ended December 31, 2014:
|  | Number of shares |  |  | Weighted- average grant Date fair value |  |  | Aggregate intrinsic value (in millions) |
Balance at December 31, 2011 |  |  | 187,810 |  |  | $ | 26.33 |  |  |  |  |
RSUs granted |  |  | 109,200 |  |  |  | 31.37 |  |  |  |  |
RSUs vested |  |  | (34,190 | ) |  |  | 27.85 |  |  |  |  |
RSUs cancelled/forfeited/expired |  |  | — |  |  |  | — |  |  |  |  |
Balance at December 31, 2012 |  |  | 262,820 |  |  |  | 28.22 |  |  |  |  |
RSUs granted |  |  | 150,300 |  |  |  | 26.89 |  |  |  |  |
RSUs vested |  |  | (87,840 | ) |  |  | 24.98 |  |  |  |  |
RSUs cancelled/forfeited/expired |  |  | (4,300 | ) |  |  | 29.24 |  |  |  |  |
Balance at December 31, 2013 |  |  | 320,980 |  |  |  | 28.47 |  |  |  |  |
RSUs granted |  |  | 118,864 |  |  |  | 30.85 |  |  |  |  |
RSUs vested |  |  | (120,721 | ) |  |  | 27.30 |  |  |  |  |
RSUs cancelled/forfeited/expired |  |  | (7,540 | ) |  |  | 30.34 |  |  |  |  |
Balance at December 31, 2014 |  |  | 311,583 |  |  | $ | 29.78 |  |  | $ | 11.2 |

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