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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2020
Deferred Compensation Arrangements [Abstract] |
Share-based Payment Arrangement, Expensed and Capitalized, Amount | The following is a summary of stock-based compensation expense, net of forfeitures, included in General and administrative expenses in the Condensed Consolidated Statements of Income ($ in thousands):
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Non-cash stock-based compensation expense | $ | 457 |  |  | $ | 477 |  |  | $ | 2,772 |  |  | $ | 2,955 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The fair value of each grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:
| 2020 |  | 2019 |  |
Dividend yield | 5.1% |  | 5.5% |  |
Expected volatility | 17.1% |  | 18.6% |  |
Expected lives | 2.9 years |  | 2.9 years |  |
Risk-free interest rate | 1.30% |  | 2.50% |  |
Schedule of Stock Option Activity | The following table summarizes our outstanding stock options:
|  |  |  |  | Weighted Average |  |
| Number |  | Weighted Average |  | Remaining |  |
| of Shares |  | Exercise Price |  | Contractual Life (Years) |  |
Options outstanding January 1, 2019 | 920,346 |  |  | $69.24 |  |  |  |
Options granted | 602,000 |  |  | $79.96 |  |  |  |
Options exercised | (431,993) |  |  | $70.55 |  |  |  |
Options outstanding, September 30, 2019 | 1,090,353 |  |  | $74.63 |  |  |  |
Exercisable at September 30, 2019 | 599,834 |  |  | $74.34 |  |  |  |
Options outstanding January 1, 2020 | 1,004,014 |  |  | $74.35 |  |  |  |
Options granted | 592,000 |  |  | $90.32 |  |  |  |
Options exercised | (512,509) |  |  | $72.98 |  |  |  |
Options forfeited | (10,500) |  |  | $88.73 |  |  |  |
Options outstanding, September 30, 2020 | 1,073,005 |  |  | $83.68 |  | 3.70 |  |
Exercisable at September 30, 2020 | 601,994 |  |  | $81.09 |  | 3.40 |  |

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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=120381028&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=120381028&loc=d3e5047-113901 + 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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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