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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of unvested restricted stock awards | The following tables summarize the unvested restricted stock awards at December 31, 2017 and 2016.
|  | Years Ended December 31, |
|  | 2017 |  | 2016 |
Perfomance Awards |  | Shares |  | Weighted- Average Grant Date Fair Value |  | Shares |  | Weighted- Average Grant Date Fair Value |
Unvested at beginning |  | 33,226 |  | $ | 42.60 |  | — |  | $ | — |
Issued |  | 36,523 |  | 57.49 |  | 34,957 |  | 42.60 |
Forfeited |  | (2,520 | ) | 41.93 |  | (1,731 | ) | 42.60 |
Vested |  | (4,891 | ) | 54.70 |  | — |  | — |
Unvested at end |  | 62,338 |  | $ | 50.45 |  | 33,226 |  | $ | 42.60 |
|  | Years Ended December 31, |
|  | 2017 |  | 2016 |
Time Vested Awards |  | Shares |  | Weighted- Average Grant Date Fair Value |  | Shares |  | Weighted- Average Grant Date Fair Value |
Unvested at beginning |  | 262,966 |  | $ | 33.60 |  | 369,093 |  | $ | 24.43 |
Issued |  | 91,097 |  | 62.70 |  | 104,775 |  | 46.39 |
Forfeited |  | (2,360 | ) | 49.52 |  | (8,749 | ) | 39.82 |
Vested |  | (187,660 | ) | 30.07 |  | (202,153 | ) | 23.22 |
Unvested at end |  | 164,043 |  | $ | 53.57 |  | 262,966 |  | $ | 33.87 |
Schedule of activity of stock options | Below is a summary of stock option activity for the twelve months ended December 31, 2017, 2016 and 2015. The information excludes restricted stock units and awards.
|  | Years Ended December 31, |
|  | 2017 |  | 2016 |  | 2015 |
|  | Shares |  | Weighted- Average Exercise Price |  | Shares |  | Weighted- Average Exercise Price |  | Shares |  | Weighted- Average Exercise Price |
Beginning balance |  | 216,859 |  | $ | 8.80 |  | 298,740 |  | $ | 9.97 |  | 759,683 |  | $ | 11.36 |
Issued |  | — |  | — |  | 3,000 |  | 49.49 |  | 5,000 |  | 46.50 |
Exercised |  | (72,535 | ) | 8.19 |  | (77,144 | ) | 14.48 |  | (443,912 | ) | 12.03 |
Forfeited |  | — |  | — |  | (1,100 | ) | 15.48 |  | (12,380 | ) | 29.58 |
Expired |  | (1,100 | ) | 5.76 |  | (6,637 | ) | 12.87 |  | (9,651 | ) | 18.19 |
Ending balance |  | 143,224 |  | $ | 9.13 |  | 216,859 |  | $ | 8.80 |  | 298,740 |  | $ | 9.97 |
Schedule of stock option by exercise price range | The following summarizes information about stock options outstanding at December 31, 2017. The information excludes restricted stock units and awards.
|  |  |  |  |  | Weighted-Average |
Outstanding: |  | Stock Options |  | Weighted-Average |  | Remaining |
Range of Exercise Prices |  | Outstanding |  | Exercise Price |  | Contractual Life |
$5.76 |  | $10.72 |  | 99,975 |  | $ | 5.76 |  | 1.02 |
$10.73 |  | $11.40 |  | 35,339 |  | 10.84 |  | 0.60 |
$11.41 |  | $24.86 |  | 1,160 |  | 22.11 |  | 5.26 |
$24.87 |  | $49.91 |  | 6,750 |  | 47.83 |  | 8.12 |
|  |  |  | 143,224 |  | $ | 9.13 |  | 1.29 |
Exercisable: |  | Stock Options |  | Weighted-Average |  |  |
Range of Exercise Prices |  | Exercisable |  | Exercise Price |  |  |
$5.76 |  | $10.72 |  | 65,277 |  | $ | 5.76 |  |  |
$10.73 |  | $11.40 |  | 35,339 |  | 10.84 |  |  |
$11.41 |  | $24.86 |  | — |  | — |  |  |
$24.87 |  | $49.91 |  | 2,000 |  | 47.62 |  |  |
|  |  |  | 102,616 |  | $ | 8.33 |  |  |
Schedule of valuation assumptions used for stock options | The fair value of each stock option grant is estimated on the date of grant using the Black-Scholes option pricing model with the assumptions as shown in the table below used for grants during the years ended December 31, 2017, 2016 and 2015.
|  | Years Ended December 31, |
|  | 2017 |  | 2016 |  | 2015 |
Expected volatility |  | n/a |  | 24.23 | % | 31.21 | %
Weighted-Average volatility |  | n/a |  | 24.23 | % | 31.21 | %
Expected dividends |  | — |  | — |  | — |
Expected term (in years) |  | n/a |  | 7.0 |  | 7.0 |
Risk-free rate |  | n/a |  | 1.37 | % | 1.64 | %
Weighted-average fair value (grant date) |  | n/a |  | $ | 14.27 |  | $ | 16.73 |
Schedule of cash proceeds received from share-based payment awards | Cash proceeds, tax benefits and intrinsic value related to total stock options exercised is as follows:
|  | Years Ended December 31, |
(dollars in thousands) |  | 2017 |  | 2016 |  | 2015 |
Proceeds from stock options exercised |  | $ | 372 |  | $ | 955 |  | $ | 5,176 |
Tax benefits realized from stock compensation |  | — |  | 400 |  | 2,984 |
Intrinsic value of stock options exercised |  | 3,888 |  | 2,824 |  | 11,042 |

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- Definition Tabular disclosure of cash received from exercise of stock options and similar instruments granted under share-based payment arrangements and tax benefit from exercise of stock options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + 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 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 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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