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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Stock-based Compensation Expense | The components of the Company’s stock-based compensation expense for the six months ended June 30, 2019 and 2018 are as follows:
| Six Months Ended June 30, |  |
| 2019 |  | 2018
| (in thousands) |  |
Stock options | $ | 1,326 |  | $ | 1,514
Restricted stock and restricted stock units | 1,998 |  | 1,292
Employee Stock Purchase Plan | 335 |  | 289
Total pre-tax stock-based compensation expense charged against income 1 | $ | 3,659 |  | $ | 3,095
1.Stock-based compensation expense is recorded in cost of services and 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, 2018 and changes during the six months ended June 30, 2019 is as follows:
| Stock Options Outstanding |  |
| Number of Shares |  | Weighted Average Exercise Price
| (in thousands) |  |
December 31, 2018 | 2,121 |  | $ | 31.53
Granted | 188 |  | $ | 40.49
Exercised | (123) |  | $ | 24.70
Forfeited | (10) |  | $ | 36.38
Expired | (7) |  | $ | 27.33
June 30, 2019 | 2,169 |  | $ | 32.69
Assumption For Fair Value of Options Granted | The fair value of stock option awards granted in 2019 and 2018 was estimated on the date of grant using the Black-Scholes option valuation model with the following assumptions:
| Six Months Ended June 30, |  |
| 2019 |  | 2018
Risk-free interest rate | 2.5 | % |  | 2.1 | %
Weighted average expected life | 5.7 years |  | 5.8 years
Expected volatility | 22.6 | % |  | 21.4 | %
Dividend yield | 1.9 | % |  | 1.5 | %
Summarized Information of Stock Options Outstanding | The following table summarizes other information about the stock options at June 30, 2019:
| June 30, 2019
| (amounts in thousands, except per share data)
Outstanding: |
Aggregate intrinsic value | $ | 5,846
Weighted average remaining contractual life | 5.9 years
Exercisable: |
Number of options | 1,305
Weighted average exercise price | $ | 28.09
Aggregate intrinsic value | $ | 5,844
Weighted average remaining contractual life | 4.7 years
Summary of Stock Options Outstanding | A summary of the outstanding restricted stock units and restricted stock as of December 31, 2018 and changes during the six months ended June 30, 2019 is as follows:
| Restricted Stock Units and Restricted Stock |  |
| Number |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
December 31, 2018 | 241 |  | $ | 45.47
Granted | 194 |  | $ | 40.49
Vested | (60) |  | $ | 42.91
Forfeited | (4) |  | $ | 45.69
June 30, 2019 | 371 |  | $ | 43.28
Weighted Average Grant-Date Fair Values and Intrinsic Values of Options Vested | The expense associated with the options granted under the ESPP during the six months ended June 30, 2019 and 2018 was estimated on the date of grant using the Black-Scholes option valuation model with the following assumptions:
| Six Months Ended June 30, |  |
| 2019 |  | 2018
Risk-free interest rate | 2.57% |  |  | 1.89% |
Weighted average expected life (years) | 1.0 |  | 1.0
Expected volatility | 30.8% |  |  | 20.8% |
Dividend yield | 1.9% |  |  | 1.4% |
Summary of ESPP Annual Offerings | The following table summarizes information about the SERP during the six months ended June 30, 2019 and 2018:
| Six Months Ended June 30, |  |
| 2019 |  | 2018
| (in thousands) |  |
SERP expense 1 | $ | 346 |  | $ | 328
Unrealized gain recorded in SERP liability account | $ | 4,939 |  | $ | 1,118
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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&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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