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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Stock-based compensation plans |
Schedule of components of stock compensation expense |
|  | 2016 |  | 2015 |  | 2014 |
|  | (in thousands) |
2007 Stock Incentive Plan |  | $ | 3,681 |  | $ | 4,102 |  | $ | 3,459 |
Employee Stock Purchase Plan |  |  | 36 |  |  | 48 |  |  | 50 |
Total Stock Compensation Expense |  | $ | 3,717 |  | $ | 4,150 |  | $ | 3,509 |
Restricted stock |
Stock-based compensation plans |
Summary of activity under the 2007 Plan |
|  | Shares |
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 |
Granted in 2016 (vesting over 2 years) |  | 20,000 |
Granted in 2016 (vesting over 3 years) |  | 85,000 |
Granted in 2016 (vesting over 4 years) |  | 13,250 |
Granted in 2016 (vesting on first anniversary from date of issuance) |  | 18,395 |
Cancelled in 2016 |  | (20,377) |
Vested in 2016 |  | (213,528) |
Restricted stock at December 31, 2016 |  | 299,335 |
Summary of activity under the 2007 Plan |
|  |  |  | Weighted Average |  | Aggregate Grant |
|  | Number Outstanding |  | Grant Date Fair Value |  | Date Fair Value |
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 |  | $ | 13.71 |  | $ | 8,786,611 |
Shares granted |  | 146,440 |  |  | 18.53 |  |  | 2,713,159 |
Shares cancelled |  | — |  |  | — |  |  | — |
Shares vested |  | (275,201) |  |  | 15.87 |  |  | (4,368,570) |
Balance as of December 31, 2015 |  | 396,595 |  | $ | 17.98 |  | $ | 7,131,200 |
Shares granted |  | 136,645 |  |  | 21.55 |  |  | 2,944,941 |
Shares cancelled |  | (20,377) |  |  | 17.79 |  |  | (362,536) |
Shares vested |  | (213,528) |  |  | 17.12 |  |  | (3,655,269) |
Balance as of December 31, 2016 |  | 299,335 |  | $ | 20.24 |  | $ | 6,058,336 |

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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 changes in outstanding nonvested shares. + 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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