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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Fair Value of Option Grants | The fair value of option grants is estimated on the grant date using the Black-Scholes option-pricing model with the following assumptions for option grants during the six months ended June 30, 2013 and 2012:
|  | The Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |
Expected volatility |  |  | 48.49 | % |  |  | 48.49 | %
Expected dividends |  |  | 0.00 | % |  |  | 0.00 | %
Expected term (in years) |  |  | 10.00 |  |  |  | 10.00 |
Risk-free rate |  |  | 1.76 | % |  |  | 2.20 | %
Vesting period (in years) |  |  | 5 |  |  |  | 5 |
Summary of Company's Stock Option Plan Activity | A summary of the status of the Company’s stock option plan is presented below (shares in thousands):
|  | Number of Shares |  |  | Weighted Average Price Per Share |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value |
Options outstanding at January 1, 2013 |  |  | 887 |  |  | $ | 8.66 |  |  |  |  |  |  |  |  |
Granted |  |  | 100 |  |  |  | 16.73 |  |  |  |  |  |  |  |  |
Exercised |  |  | (98 | ) |  |  | 5.46 |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Options outstanding at June 30, 2013 |  |  | 889 |  |  | $ | 9.92 |  |  |  | 6.0 |  |  | $ | 13,403 |
Options exercisable at June 30, 2013 |  |  | 561 |  |  | $ | 6.64 |  |  |  | 4.2 |  |  | $ | 10,296 |
Available for grant at June 30, 2013 |  |  | 988 |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Vesting Status of Options Outstanding | Information on the activity of options for the six months ended June 30, 2013 follows (shares in thousands):
|  | 2013 |
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Non-vested options at January 1, 2013 |  |  | 285 |  |  | $ | 15.00 |
Granted |  |  | 100 |  |  |  | 16.73 |
Vested |  |  | (57 | ) |  |  | 15.00 |
Forfeited |  |  | — |  |  |  | — |
Non-vested options at June 30, 2013 |  |  | 328 |  |  | $ | 15.53 |

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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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- 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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- 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=6415400&loc=d3e5070-113901 + Details
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