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Stock Option and Equity Incentive Plans (Details 3) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Incentive Plan | Dec. 31, 2012 Options | Dec. 31, 2011 Options | Dec. 31, 2010 Options | Dec. 31, 2012 Restricted Stock Units | Dec. 31, 2011 Restricted Stock Units | Dec. 31, 2010 Restricted Stock Units | Jun. 14, 2012 Common stock Non-employee members of Board of Directors | Dec. 31, 2012 Common stock Non-employee members of Board of Directors | Dec. 31, 2011 Common stock Non-employee members of Board of Directors | Dec. 31, 2012 Common stock Executive officers | Dec. 31, 2011 Common stock Executive officers | Dec. 31, 2010 Common stock Executive officers | Feb. 17, 2012 Common stock Incentive Plan Chairman, Chief Executive Officer and President | Dec. 31, 2012 Common stock Incentive Plan Chairman, Chief Executive Officer and President | Dec. 31, 2011 Common stock Incentive Plan Chairman, Chief Executive Officer and President | Dec. 31, 2010 Common stock Incentive Plan Chairman, Chief Executive Officer and President
Stock Option and Equity Incentive Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The total intrinsic value of all options exercised |  |  |  |  | $ 2,039,642 | $ 2,204,962 | $ 2,711,864 |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount of consideration received from exercise of options | 365,241 | 250,538 | 507,056 |  | 505,708 | 344,417 | 850,806 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares surrendered in lieu of payment of exercise price and withholding taxes (in shares) |  |  |  |  | 22,161 | 20,492 | 62,202 |  |  |  |  |  |  |  |  |  |  |  |  |
Average market price of shares surrendered in lieu of payment of withholding taxes (in dollars per share) |  |  |  |  | $ 18.01 | $ 17.64 | $ 10.42 |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense (in dollars) |  |  |  |  | 132,774 | 141,499 | 213,716 | 367,631 | 463,923 | 557,494 |  | 60,000 | 60,000 |  |  |  |  | 300,000 | 423,250 | 192,500
Shares approved for issuance |  |  |  | 108,866 |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  |  |
Shares of common stock issued |  |  |  |  |  |  |  |  |  |  | 3,672 |  |  |  |  |  |  |  |  |
Closing price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 16.32 |  |  |  |  |  |  |  |  |
Grant date fair value of stock measured at closing price (in dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 55,000 | 79,248 |  |  |  |
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  |  |  |  |  |  | 176,209 |  |  |  |  |  |  |  |  |  |  |  |
Awarded (in shares) |  |  |  |  |  |  |  | 13,553 |  |  |  |  |  |  |  |  |  |  |  |
Shares distributed (in shares) |  |  |  |  |  |  |  | (80,896) |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in shares) |  |  |  |  |  |  |  | 108,866 | 176,209 |  |  |  |  |  |  |  |  |  |  |
Weighted Average Award Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  | $ 6.98 |  |  |  |  |  |  |  |  |  |  |  |
Awarded (in dollars per share) |  |  |  |  |  |  |  | $ 15.62 |  |  |  |  |  |  |  |  |  |  |  |
Shares distributed (in dollars per share) |  |  |  |  |  |  |  | $ 5.96 |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars per share) |  |  |  |  |  |  |  | $ 8.77 | $ 6.98 |  |  |  |  |  |  |  |  |  |  |
Net-share settlement (in shares) |  |  |  |  |  |  |  | 25,684 | 30,920 | 19,579 |  |  |  |  |  |  |  |  |  |
Net-share settlement, market price per share |  |  |  |  |  |  |  | $ 16.10 | $ 18.19 | $ 9.25 |  |  |  |  |  |  |  |  |  |
Future share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 (in dollars) | 342,305 |  |  |  | 70,080 |  |  | 272,225 |  |  |  |  |  |  |  |  |  |  |  |
2014 (in dollars) | 173,272 |  |  |  | 43,892 |  |  | 129,380 |  |  |  |  |  |  |  |  |  |  |  |
2015 (in dollars) | 74,428 |  |  |  | 12,962 |  |  | 61,466 |  |  |  |  |  |  |  |  |  |  |  |
2016 (in dollars) | 6,818 |  |  |  |  |  |  | 6,818 |  |  |  |  |  |  |  |  |  |  |  |
Total | 596,823 |  |  |  | 126,934 |  |  | 469,889 |  |  |  |  |  |  |  |  |  |  |  |
Tax benefits recognized as additional paid-in capital | $ 831,584 | $ 699,659 | $ 854,015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + 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=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 65 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Price of a single share of a number of saleable stocks of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration