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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock-based Compensation Expense | The components of the Company’s stock-based compensation expense for the three months ended March 31, 2018 and 2017 are as follows:
| Three Months Ended March 31,
| 2018 |  | 2017
| (in thousands)
Stock options | $ | 771 |  |  | $ | 1,172 |
Restricted stock and restricted stock units | 637 |  |  | 287 |
Employee Stock Purchase Plan | 161 |  |  | 121 |
Total pre-tax stock-based compensation expense charged against income (1) | $ | 1,569 |  |  | $ | 1,580 |
(1) | Stock-based compensation expense is recorded in selling, general and administrative expense in the Company’s Consolidated Statements of Comprehensive Income.
Summary of Other Information of Stock Option Plans | A summary of stock options outstanding under the Plan as of December 31, 2017 and changes during the three months ended March 31, 2018 is as follows:
| Stock Options Outstanding
| Number of Shares |  | Weighted Average Exercise Price
| (in thousands) |  |
December 31, 2017 | 2,374 |  |  | $ | 29.22 |
Granted | 169 |  |  | $ | 52.06 |
Exercised | (177 | ) |  | $ | 28.19 |
Forfeited | (16 | ) |  | $ | 35.51 |
Expired | — |  |  | $ | — |
March 31, 2018 | 2,350 |  |  | $ | 30.90 |
Assumption For Fair Value of Options Granted | The fair value of stock option awards granted in 2018 and 2017 was estimated on the date of grant using the Black-Scholes option valuation model with the following assumptions:
| Three Months Ended March 31,
| 2018 |  | 2017
Risk-free interest rate | 2.1 | % |  | 2.0 | %
Weighted average expected life | 5.8 years |  |  | 5.8 years |
Expected volatility | 21.4 | % |  | 25.1 | %
Dividend yield | 1.5 | % |  | 1.9 | %
Summarized Information of Stock Options Outstanding | The following table summarizes other information about the stock options at March 31, 2018:
| March 31, 2018
| (amounts in thousands, except per share data)
Outstanding: |
Aggregate intrinsic value | $ | 31,016 |
Weighted average remaining contractual life | 6.5 years |
Exercisable: |
Number of options | 1,231 |
Weighted average exercise price | $ | 24.76 |
Aggregate intrinsic value | $ | 23,043 |
Weighted average remaining contractual life | 5.1 years |
Schedule of Restricted Stock Outstanding Stock-based Compensation | A summary of the outstanding restricted stock and stock units as of December 31, 2017 and changes during the three months ended March 31, 2018 is as follows:
| Restricted Stock and Restricted Stock Units
| Number of Restricted Shares/Units |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
December 31, 2017 | 145 |  |  | $ | 37.07 |
Granted | 139 |  |  | $ | 52.06 |
Vested | (34 | ) |  | $ | 35.16 |
Forfeited | (2 | ) |  | $ | 52.06 |
March 31, 2018 | 248 |  |  | $ | 45.64 |
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions | The expense associated with the options granted under the ESPP during the three months ended March 31, 2018 and 2017 was estimated on the date of grant using the Black-Scholes option valuation model with the following assumptions:
| Three Months Ended March 31,
| 2018 |  | 2017
Risk-free interest rate | 1.89% |  | 1.05%
Weighted average expected life (years) | 1.0 |  | 1.0
Expected volatility | 20.8% |  | 21.2%
Dividend yield | 1.4% |  | 1.9%
Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments | The following table summarizes information about the SERP during the three months ended March 31, 2018 and 2017:
| Three Months Ended March 31,
| 2018 |  | 2017
| (in thousands)
SERP expense (1) | $ | 191 |  |  | $ | 160 |
Unrealized gain recorded in SERP liability account | $ | 231 |  |  | $ | 1,161 |
(1) | Both the SERP match and the deferrals are included in the selling, general and administrative caption in the Consolidated Statements of Comprehensive Income.

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- Definition Tabular disclosure of an equity-based arrangement (such as stock or unit options and stock or unit awards) with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain equity-based awards at future dates, sometimes including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares or units issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20517-108367 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 employee stock purchase plans, including, but not limited to: (a) expected term, (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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- 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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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