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Stock Options and Restricted Stock (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Options Outstanding | The following table summarizes information about the stock options outstanding under the 2005 Incentive Plan at December 31, 2013, 2014 and 2015:
|  | Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life (in years) |
Outstanding at January 1, 2013 |  |  | 832,548 |  |  |  | 10.51 |  |  |  | 4.6 |
Granted |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (256,300 | ) |  |  | 9.00 |  |  |  | — |
Canceled, forfeited, or expired |  |  | — |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2013 |  |  | 576,248 |  |  |  | 11.12 |  |  |  | 3.8 |
Exercisable at December 31, 2013 |  |  | 557,448 |  |  |  | 10.91 |  |  |  | 3.7 |
Outstanding at January 1, 2014 |  |  | 576,248 |  |  |  | 11.12 |  |  |  | 3.8 |
Granted |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (294,165 | ) |  |  | 9.09 |  |  |  | — |
Canceled, forfeited, or expired |  |  | — |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2014 |  |  | 282,083 |  |  |  | 11.30 |  |  |  | 3.6 |
Exercisable at December 31, 2014 |  |  | 282,083 |  |  |  | 11.30 |  |  |  | 3.6 |
Outstanding at January 1, 2015 |  |  | 282,083 |  |  |  | 11.30 |  |  |  | 3.6 |
Granted |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | (193,204 | ) |  |  | 9.55 |  |  |  | — |
Canceled, forfeited, or expired |  |  | — |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2015 |  |  | 88,879 |  |  |  | 12.10 |  |  |  | 4.3 |
Exercisable at December 31, 2015 |  |  | 88,879 |  |  |  | 12.10 |  |  |  | 4.3 |
Weighted Average Grant Date Fair Values of Options Granted |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | (in thousands) |
Cash received from option exercises |  | $ | 1,844 |  |  | $ | 2,674 |  |  | $ | 2,344 |
Total tax benefits realized for tax deductions from options exercised |  |  | 2,109 |  |  |  | 2,797 |  |  |  | 2,002 |
Total intrinsic value of options exercised |  |  | 6,969 |  |  |  | 9,145 |  |  |  | 6,654 |
Grant date fair value of options vested |  |  | — |  |  |  | 144 |  |  |  | 226 |
Aggregate intrinsic value of vested options outstanding |  |  | 3,448 |  |  |  | 8,763 |  |  |  | 17,467 |
Restricted Stock Outstanding | The following table summarizes information about the restricted stock outstanding under the 2005 Incentive Plan at December 31, 2015:
|  | Shares |  |  | Weighted-Average Grant-Date Fair Value per Share
Nonvested balance at January 1, 2013 |  |  | 8,000 |  |  | 27.47
Granted |  |  | — |  |  | —
Vested |  |  | (1,600 | ) |  | 27.47
Forfeited |  |  | — |  |  | —
Nonvested balance at December 31, 2013 |  |  | 6,400 |  |  | 27.47
Granted |  |  | — |  |  | —
Vested |  |  | (800 | ) |  | 27.35
Forfeited |  |  | (3,200 | ) |  | 27.59
Nonvested balance at December 31, 2014 |  |  | 2,400 |  |  | 27.35
Granted |  |  | — |  |  | —
Vested |  |  | (800 | ) |  | 27.35
Forfeited |  |  | — |  |  | —
Nonvested balance at December 31, 2015 |  |  | 1,600 |  |  | 27.35
|  | Shares |  |  | Weighted-Average Grant-Date Fair Value per Share |
Nonvested balance at January 1, 2012 |  |  | 7,833 |  |  |  | 26.79 |
Granted |  |  | 5,376 |  |  |  | 33.47 |
Vested |  |  | (7,833 | ) |  |  | 26.79 |
Forfeited |  |  | — |  |  |  | — |
Nonvested balance at December 31, 2013 |  |  | 5,376 |  |  |  | 33.47 |
Granted |  |  | 5,229 |  |  |  | 37.27 |
Vested |  |  | (5,376 | ) |  |  | 33.47 |
Forfeited |  |  | — |  |  |  | — |
Nonvested balance at December 31, 2014 |  |  | 5,229 |  |  |  | 37.27 |
Granted |  |  | 7,112 |  |  |  | 44.26 |
Vested |  |  | (5,229 | ) |  |  | 37.27 |
Forfeited |  |  | — |  |  |  | — |
Nonvested balance at December 31, 2015 |  |  | 7,112 |  |  |  | 44.26 |
|  | Shares |  |  | Weighted-Average Grant-Date Fair Value per Share |
Nonvested balance at January 1, 2013 |  |  | 2,331 |  |  |  | 26.79 |
Granted |  |  | 80,278 |  |  |  | 34.14 |
Vested |  |  | — |  |  |  | — |
Forfeited |  |  | — |  |  |  | — |
Nonvested balance at December 31, 2013 |  |  | 82,609 |  |  |  | 33.93 |
Granted |  |  | 4,312 |  |  |  | 43.83 |
Vested |  |  | (14,000 | ) |  |  | 33.58 |
Forfeited |  |  | — |  |  |  | — |
Nonvested balance at December 31, 2014 |  |  | 72,921 |  |  |  | 34.59 |
Granted |  |  | 50,461 |  |  |  | 45.80 |
Vested |  |  | (27,537 | ) |  |  | 37.27 |
Forfeited |  |  | (18,317 | ) |  |  | 35.48 |
Nonvested balance at December 31, 2015 |  |  | 77,528 |  |  |  | 40.57 |

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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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