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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Stock Compensation Expense | The following table summarizes stock option compensation expense for the years ended December 31, 2017 and 2016:
|  | Years Ended December 31, |
|  | 2017 |  |  | 2016 |
Total share-based compensation - stock options |  | $ | 1,294 |  |  | $ | 899 |
Income tax benefit |  |  | 521 |  |  |  | 360 |
Unrecognized compensation expense |  |  | 729 |  |  |  | 1,752 |
Weighted-average amortization period remaining |  | 1.2 years |  |  | 1.8 years |
Restricted Shares |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Stock Compensation Expense | The following table summarizes restricted stock compensation expense for the year ended December 31, 2017:
|  | Year Ended December 31 |
|  | 2017 |
Total share-based compensation - restricted stock |  | $ | 203 |
Income tax benefit |  |  | 83 |
Unrecognized compensation expense |  |  | 1,227 |
Weighted-average amortization period remaining |  | 2.8 years |
Omnibus Plan |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Changes in Restricted Shares | The following table discloses the changes in restricted shares for the year ended December 31, 2017:
|  | Omnibus Plan |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Beginning balance |  |  | — |  |  | $ | — |
Granted |  |  | 70,798 |  |  |  | 20.31 |
Vested |  |  | — |  |  |  | — |
Forfeited |  |  | (400 | ) |  |  | 20.18 |
Ending balance outstanding at December 31, 2017 |  |  | 70,398 |  |  | $ | 20.31 |
BYB Plan |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Fair Value Assumptions of Stock Options | The fair values of the stock options were determined using the Black-Scholes-Merton model for Time Options and a Monte Carlo simulation model for Performance Options. The fair values of options under the BYB Plan were determined using the following assumptions as of the grant dates:
|  | Time Options Grants |
|  | 2016 |  |  | 2015 |
Risk-free interest rate |  | 1.34% - 1.40% |  |  | 1.68% - 1.85% |
Expected term (years) |  | 5.2 - 5.6 |  |  | 5.7 - 6.3 |
Expected stock price volatility |  |  | 20.39 | % |  | 16.18% - 16.55% |
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Weighted average grant date fair value |  | $ | 3.55 |  |  | $ | 2.25 |
|  | Performance Options Grants |
|  | 2016 |  |  | 2015 |
Risk-free interest rate |  | Implied forward rates |  |  | Implied forward rates |
Expected term (years) |  | Variable |  |  | Variable |
Expected stock price volatility |  | 20.34% - 20.39% |  |  | 16.18% - 16.55% |
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Weighted average grant date fair value |  | $ | 3.75 |  |  | $ | 1.65 |
Summary of Activity in shares Subjected to Options and Weighted Average Exercise Prices | The following table discloses the activity in shares subject to options and the weighted average exercise prices, in actual dollars, for the year ended December 31, 2017:
|  | BYB Plan |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Intrinsic Value |  |  | Weighted Average Remaining Contractual Term (in Years) |
Beginning balance |  |  | 1,798,220 |  |  | $ | 11.95 |  |  | $ | 15,788 |  |  |  | 8.6 |
Granted |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
Expired |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeited |  |  | (15,200 | ) |  | 16.25 |  |  |  |  |  |  |  |  |
Ending balance outstanding at December 31, 2017 |  |  | 1,783,020 |  |  | $ | 11.91 |  |  | $ | 19,718 |  |  |  | 7.6 |
Exercisable at December 31, 2017 |  |  | 1,304,257 |  |  | $ | 11.51 |  |  | $ | 14,953 |  |  |  | 7.5 |

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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 the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -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 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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