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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017 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, 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 |  |  |  |  |  |  |  |  |
Options granted |  |  | 881,800 |  |  |  | 25.26 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (368,085 | ) |  |  | 27.34 |  |  |  |  |  |  |  |  |
Options cancelled/forfeited/expired |  |  | (339,930 | ) |  |  | 28.62 |  |  |  |  |  |  |  |  |
Balance at December 31, 2016 |  |  | 1,584,435 |  |  |  | 28.14 |  |  |  |  |  |  |  |  |
Options granted |  |  | 299,600 |  |  |  | 34.66 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (398,275 | ) |  |  | 28.94 |  |  |  |  |  |  |  |  |
Options cancelled/forfeited/expired |  |  | (276,900 | ) |  |  | 28.04 |  |  |  |  |  |  |  |  |
Balance at December 31, 2017 |  |  | 1,208,860 |  |  | $ | 29.52 |  |  |  | 4.94 |  |  | $ | 21.1 |
Exercisable at December 31, 2017 |  |  | 325,680 |  |  | $ | 28.65 |  |  |  | 4.04 |  |  | $ | 6.0 |
Expected to vest after December 31, 2017 |  |  | 680,049 |  |  | $ | 29.78 |  |  |  | 5.28 |  |  | $ | 11.7 |
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, 2017:
|  | Options Outstanding |  |  | Options Exercisable |
Exercise price |  | Number outstanding at December 31, 2017 |  |  | Weighted- average remaining contractual life (Years) |  |  | Weighted- average grant date value |  |  | Number exercisable at December 31, 2017 |  |  | Weighted- average grant date value |
$20 – 25 |  |  | 481,510 |  |  |  | 5.13 |  |  | $ | 24.59 |  |  |  | 125,505 |  |  | $ | 24.58 |
$25 – 30 |  |  | 57,505 |  |  |  | 3.14 |  |  | $ | 28.05 |  |  |  | 37,300 |  |  | $ | 28.91 |
$30 – 35 |  |  | 654,265 |  |  |  | 4.94 |  |  | $ | 33.07 |  |  |  | 160,635 |  |  | $ | 32.09 |
$35 – 40 |  |  | 8,780 |  |  |  | 5.32 |  |  | $ | 38.61 |  |  |  | 2,240 |  |  | $ | 38.18 |
$40 – 45 |  |  | 6,800 |  |  |  | 6.67 |  |  | $ | 40.37 |  |  |  | — |  |  | $ | — |
$20 – 45 |  |  | 1,208,860 |  |  |  | 4.94 |  |  | $ | 29.52 |  |  |  | 325,680 |  |  | $ | 28.65 |
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, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Expected term (in years) |  |  | 5.0 |  |  |  | 5.0 |  |  |  | 5.0 |
Expected volatility |  |  | 26.1 | % |  |  | 28.7 | % |  |  | 31.1 | %
Expected dividend yields |  |  | 3.0 | % |  |  | 4.1 | % |  |  | 3.2 | %
Risk-free interest rates |  |  | 2.0 | % |  |  | 1.2 | % |  |  | 1.6 | %
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, 2017:
|  |  |  |  |  | Weighted- |  |  | Aggregate |
|  |  |  |  |  | average |  |  | intrinsic |
|  | Number |  |  | grant date |  |  | value |
|  | of shares |  |  | fair value |  |  | (in millions) |
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 |  |  |  |  |
RSUs granted |  |  | 31,900 |  |  |  | 25.75 |  |  |  |  |
RSUs vested |  |  | (59,008 | ) |  |  | 29.69 |  |  |  |  |
RSUs cancelled/forfeited/expired |  |  | (68,300 | ) |  |  | 29.33 |  |  |  |  |
Balance at December 31, 2016 |  |  | 125,240 |  |  |  | 30.66 |  |  |  |  |
RSUs granted |  |  | 70,960 |  |  |  | 34.53 |  |  |  |  |
RSUs vested |  |  | (36,336 | ) |  |  | 26.99 |  |  |  |  |
RSUs cancelled/forfeited/expired |  |  | (66,200 | ) |  |  | 32.63 |  |  |  |  |
Balance at December 31, 2017 |  |  | 93,664 |  |  | $ | 33.62 |  |  | $ | 4.4 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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