XML 46 R35.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Share-Based Compensation (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock Option Assumptions | The following weighted average assumptions were used to determine the fair value of the stock options granted on the original grant date for expense recognition purposes for options granted during the nine months ended September 30, 2018 and 2017 using a Black Scholes Model:
| Nine months ended
| September 30, 2018 |  | September 30, 2017
Directors and Officers: |  |  |
Expected dividend rate | $ | 0.26 |  |  | $ | 0.26 |
Expected volatility | 29.73 | % |  | 30.81 | %
Risk-free interest rate | 2.20 | % |  | 1.90 | %
Expected life (in years) | 5.0 |  |  | 5.0 |
Employees: |  |  |  |  |
Expected dividend rate | $ | 0.26 |  |  | $ | 0.26 |
Expected volatility | 29.82 | % |  | 30.70 | %
Risk-free interest rate | 2.48 | % |  | 1.88 | %
Expected life (in years) | 5.0 |  |  | 5.0 |
Summary of Stock Options Outstanding | The following is a summary of stock options vested and exercisable as of September 30, 2018:
Range of Exercise Prices |  | Number of Shares |  | Weighted Average Remaining Contractual Life (in years) |  | Weighted Average Exercise Price |  | Intrinsic Value (in thousands)
$5.67 - $32.80 |  | 362,715 |  |  | 5.54 |  | $ | 18.14 |  |  | $ | 7,132 |
$32.85 - $33.80 |  | 5,484 |  |  | 4.08 |  | 33.18 |  |  | 25 |
$34.00 - $40.60 |  | 81,417 |  |  | 5.87 |  | 34.32 |  |  | 283 |
Total |  | 449,616 |  |  | 5.58 |  | $ | 21.25 |  |  | $ | 7,440 |
The following is a summary of stock options vested and exercisable as of September 30, 2017:
Range of Exercise Prices |  | Number of Shares |  | Weighted Average Remaining Contractual Life (in years) |  | Weighted Average Exercise Price |  | Intrinsic Value (in thousands)
$4.54 - $22.76 |  | 374,792 |  |  | 4.61 |  |  | $ | 10.96 |  |  | $ | 4,209 |
$23.57 - $32.80 |  | 41,490 |  |  | 7.86 |  |  | 25.61 |  |  | 18 |
$32.85 - $37.30 |  | — |  |  | — |  |  | — |  |  | — |
Total |  | 416,282 |  |  | 4.93 |  |  | $ | 12.42 |  |  | $ | 4,227 |
Summary of Stock Option Activity | A summary of option activity under the plans is as follows:
| Shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2017 | 1,567,109 |  |  | $ | 25.27 |
Granted | 1,444,520 |  |  | 34.52 |
Exercised | (234,359 | ) |  | 14.95 |
Forfeited or Expired | (229,244 | ) |  | 32.84 |
Outstanding at September 30, 2018 | 2,548,026 |  |  | $ | 30.80 |
Exercisable at September 30, 2018 | 449,616 |  |  | $ | 21.25 |
Summary of Unvested Restricted Stock Awards | A summary of the unvested restricted stock awards is as follows:
| Shares |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2017 | 341,800 |  |  | $ | 25.52 |
Granted | 104,675 |  |  | 32.28 |
Vested | (102,333 | ) |  | 24.68 |
Forfeited | (32,778 | ) |  | 28.12 |
Unvested at September 30, 2018 | 311,364 |  |  | $ | 27.80 |
Summary of Grant Date Fair Value of Awards During Period | A summary of share-based compensation is as follows:
| Three months ended |  | Nine months ended
| September 30, 2018 |  | September 30, 2017 |  | September 30, 2018 |  | September 30, 2017
Grant date fair value of awards during the period: | (in thousands)
Options | $ | 53 |  |  | $ | 121 |  |  | $ | 12,633 |  |  | $ | 3,628 |
Restricted stock | 18 |  |  | — |  |  | 3,379 |  |  | 4,182 |
Total | $ | 71 |  |  | $ | 121 |  |  | $ | 16,012 |  |  | $ | 7,810 |
Summary of Share-Based Compensation Expense |
Share-based compensation expense: |  |  |  |  |  |  |
Options | $ | 1,076 |  |  | $ | 620 |  |  | $ | 3,202 |  |  | $ | 2,050 |
Restricted stock | 839 |  |  | 811 |  |  | 2,412 |  |  | 2,910 |
Total | $ | 1,915 |  |  | $ | 1,431 |  |  | $ | 5,614 |  |  | $ | 4,960 |
Summary of Income Tax Benefit Related to Share-Based Compensation |
Income tax benefit/(deficiency) related to share-based compensation: |  |  |  |  |  |
Options | $ | 379 |  |  | $ | 126 |  |  | $ | 980 |  |  | $ | 1,411 |
Restricted stock | 26 |  |  | 131 |  |  | 245 |  |  | 836 |
Total | $ | 405 |  |  | $ | 257 |  |  | $ | 1,225 |  |  | $ | 2,247 |

X
- Definition Tabular disclosure of the grant date fair value of options and restricted sotck. + References No definition available. + Details
Name: | aaon_ScheduleOfGrantDateFairValuesTableTextBlock
Namespace Prefix: | aaon_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of tax benefit from share based compensation related to options and restricted stock. + References No definition available. + Details
Name: | aaon_ScheduleOfIncomeTaxBenefitRelatedToShareBasedCompensationTableTextBlock
Namespace Prefix: | aaon_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of share based compensation related to options and restricted stock. + References No definition available. + Details
Name: | aaon_ScheduleOfShareBasedCompensationExpenseTableTextBlock
Namespace Prefix: | aaon_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration