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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Stock-based compensation plans |
Schedule of components of stock compensation expense |
|  | 2015 |  | 2014 |  | 2013 |
|  | (in thousands) |
2007 Stock Incentive Plan |  | $ | 4,102 |  | $ | 3,459 |  | $ | 3,393 |
Employee Stock Purchase Plan |  |  | 48 |  |  | 50 |  |  | 46 |
Total Stock Compensation Expense |  | $ | 4,150 |  | $ | 3,509 |  | $ | 3,439 |
Summary of the activity under the 1996 Plan |
|  |  |  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  |  |  |  |  |  | Average |  |  |  |
|  |  |  |  |  |  |  |  | Remaining |  |  |  |
|  | Options |  |  |  | Weighted |  | Contractual |  |  |  |
|  | Available |  |  |  | Average |  | Term (in |  | Aggregate |
|  | for Grant |  | Options |  | Exercise Price |  | years) |  | Intrinsic Value |
Outstanding as of December 31, 2012 |  | — |  | 136,928 |  | $ | 8.60 |  | 2.23 |  | $ | 781,692 |
Options exercised |  | — |  | (54,991) |  |  | 7.96 |  |  |  |  |  |
Options cancelled |  | — |  | (6,500) |  |  | 5.01 |  |  |  |  |  |
Outstanding as of December 31, 2013 |  | — |  | 75,437 |  | $ | 9.38 |  | 1.49 |  | $ | 601,991 |
Options exercised |  | — |  | (26,437) |  |  | 9.71 |  |  |  |  |  |
Options cancelled |  | — |  | — |  |  | — |  |  |  |  |  |
Outstanding as of December 31, 2014 |  | — |  | 49,000 |  | $ | 9.20 |  | 0.59 |  | $ | 622,300 |
Options exercised |  | — |  | (49,000) |  |  | 9.20 |  |  |  |  |  |
Options cancelled |  | — |  | — |  |  | — |  |  |  |  |  |
Outstanding as of December 31, 2015 |  | — |  | — |  | $ | — |  | — |  | $ | — |
Vested and expected to vest at: |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2015 |  |  |  | — |  | $ | — |  | — |  | $ | — |
Options exercisable at: |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2013 |  |  |  | 75,437 |  | $ | 9.38 |  | 1.49 |  | $ | 601,991 |
December 31, 2014 |  |  |  | 49,000 |  | $ | 9.20 |  | 0.59 |  | $ | 622,300 |
December 31, 2015 |  |  |  | — |  | $ | — |  | — |  | $ | — |
Restricted stock |
Stock-based compensation plans |
Summary of activity under the 2007 Plan |
|  | Shares |
Restricted stock at December 31, 2012 |  | 682,654 |
Granted in 2013 (vesting over 4 years) |  | 130,000 |
Granted in 2013 (vesting on first anniversary from date of issuance) |  | 21,408 |
Cancelled in 2013 |  | (60,110) |
Vested in 2013 |  | (258,822) |
Restricted stock at December 31, 2013 |  | 515,130 |
Granted in 2014 (vesting over 3 years) |  | 174,500 |
Granted in 2014 (vesting over 4 years) |  | 13,000 |
Granted in 2014 (vesting on first anniversary from date of issuance) |  | 50,208 |
Cancelled in 2014 |  | (5,750) |
Vested in 2014 |  | (221,732) |
Restricted stock at December 31, 2014 |  | 525,356 |
Granted in 2015 (vesting over 3 years) |  | 125,000 |
Granted in 2015 (vesting over 4 years) |  | 5,000 |
Granted in 2015 (vesting on first anniversary from date of issuance) |  | 16,440 |
Cancelled in 2015 |  | — |
Vested in 2015 |  | (275,201) |
Restricted stock at December 31, 2015 |  | 396,595 |
Summary of activity under the 2007 Plan |
|  |  |  | Weighted Average |  |  |  |
|  | Number Outstanding |  | Grant Date Fair Value |  | Aggregate Value |
Balance as of December 31, 2012 |  | 682,654 |  | $ | 12.83 |  | $ | 8,756,990 |
Shares granted |  | 151,408 |  |  | 14.25 |  |  | 2,158,011 |
Shares cancelled |  | (60,110) |  |  | 12.41 |  |  | (745,876) |
Shares vested |  | (258,822) |  |  | 12.01 |  |  | (3,108,651) |
Balance as of December 31, 2013 |  | 515,130 |  | $ | 13.71 |  | $ | 7,060,474 |
Shares granted |  | 237,708 |  |  | 19.84 |  |  | 4,710,362 |
Shares cancelled |  | (5,750) |  |  | 14.02 |  |  | (80,630) |
Shares vested |  | (221,732) |  |  | 13.24 |  |  | (2,903,595) |
Balance as of December 31, 2014 |  | 525,356 |  | $ | 16.72 |  | $ | 8,786,611 |
Shares granted |  | 146,440 |  |  | 18.53 |  |  | 2,713,159 |
Shares cancelled |  | — |  |  | — |  |  | — |
Shares vested |  | (275,201) |  |  | 15.87 |  |  | (4,367,983) |
Balance as of December 31, 2015 |  | 396,595 |  | $ | 17.98 |  | $ | 7,131,787 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired 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=6415400&loc=d3e5070-113901 + Details
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