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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased 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, 2015 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, 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 |  |  |  |  |  |  |  |  |
Options granted |  |  | 456,200 |  |  |  | 31.69 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (270,650 | ) |  |  | 19.81 |  |  |  |  |  |  |  |  |
Options cancelled/forfeited/expired |  |  | (118,660 | ) |  |  | 29.58 |  |  |  |  |  |  |  |  |
Balance at December 31, 2015 |  |  | 1,410,650 |  |  | $ | 29.91 |  |  |  | 3.82 |  |  | $ | (6.6 | )
Exercisable at December 31, 2015 |  |  | 662,345 |  |  | $ | 27.53 |  |  |  | 1.89 |  |  | $ | (1.5 | )
Expected to vest after December 31, 2015 |  |  | 673,475 |  |  | $ | 31.64 |  |  |  | 5.53 |  |  | $ | (4.3 | )
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, 2015:
|  | Options Outstanding |  |  | Options Exercisable |
Exercise price |  | Number outstanding at December 31, 2015 |  |  | Weighted- average remaining contractual life (Years) |  |  | Weighted- average grant date value |  |  | Number exercisable at December 31, 2015 |  |  | Weighted- average grant date value |
$15 – 20 |  |  | 2,400 |  |  |  | 0.17 |  |  | $ | 15.62 |  |  |  | 2,400 |  |  | $ | 15.62 |
20 – 25 |  |  | 153,855 |  |  |  | 1.22 |  |  |  | 23.86 |  |  |  | 151,965 |  |  |  | 23.86 |
25 – 30 |  |  | 508,795 |  |  |  | 2.04 |  |  |  | 28.98 |  |  |  | 424,960 |  |  |  | 29.01 |
30 – 35 |  |  | 736,200 |  |  |  | 5.59 |  |  |  | 32.04 |  |  |  | 79,480 |  |  |  | 32.62 |
35 – 40 |  |  | 9,400 |  |  |  | 4.96 |  |  |  | 37.83 |  |  |  | 3,540 |  |  |  | 37.90 |
$15 – 40 |  |  | 1,410,650 |  |  |  | 3.82 |  |  | $ | 29.91 |  |  |  | 662,345 |  |  | $ | 27.53 |
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, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Expected term (in years) |  |  | 5.0 |  |  |  | 5.0 |  |  |  | 5.0 |
Expected volatility |  |  | 31.1 | % |  |  | 40.5 | % |  |  | 50.3 | %
Expected dividend yields |  |  | 3.2 | % |  |  | 3.0 | % |  |  | 3.3 | %
Risk-free interest rates |  |  | 1.6 | % |  |  | 1.5 | % |  |  | 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, 2015:
|  |  |  |  |  | Weighted- |  |  | Aggregate |
|  |  |  |  |  | average |  |  | intrinsic |
|  | Number |  |  | grant Date |  |  | value |
|  | of shares |  |  | fair value |  |  | (in millions) |
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 |  |  |  |  |
RSUs granted |  |  | 79,300 |  |  |  | 31.86 |  |  |  |  |
RSUs vested |  |  | (89,915 | ) |  |  | 27.97 |  |  |  |  |
RSUs cancelled/forfeited/expired |  |  | (80,320 | ) |  |  | 31.35 |  |  |  |  |
Balance at December 31, 2015 |  |  | 220,648 |  |  | $ | 30.70 |  |  | $ | 5.6 |

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