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Stock Options and Stock-Based Compensation (Details) (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2012 | Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Compensation cost | $ 302,000 |
Compensation cost recognized for options granted | 40,000 | 11,000
Unrecognized compensation costs | 240,000 | 100,000
Granted in 1995 (in shares) | 0 |
Summary of status and changes of Stock Option Plan [Roll Forward] |  |
Outstanding, beginning of period (in shares) | 51,000 |
Granted in 2012 (in shares) | 0 |
Exercised in 2012 (in shares) | (9,000) |
Forfeited in 2012 (in shares) | 0 |
Outstanding, end of period (in shares) | 42,000 | 55,500
Exercisable, end of period (in shares) | 42,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |
Outstanding options, weighted average exercise price, beginning of period (in dollars per share) | $ 16.47 |
Granted options, weighted average exercise price (in dollars per share) | $ 0 |
Exercised options, weighted average exercise price (in dollars per share) | $ 9.33 |
Forfeited options, weighted average exercise price (in dollars per share) | $ 0 |
Outstanding options, weighted average exercise price, end of period (in dollars per share) | $ 18.00 |
Exercisable options, weighted average exercise price, end of period (in dollars per share) | $ 18.00 |
Outstanding options, end of period, weighted average remaining contractual term (in years) | 2.6 |
Exercisable options, end of period, weighted average remaining contractual term (in years) | 2.6 |
Exercised options, aggregate intrinsic value | 59,000 |
Outstanding options, end of period, aggregate intrinsic value | 0 |
Exercisable options, end of period, aggregate intrinsic value | $ 0 |
Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock granted (in shares) | 19,727 |
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Award Vesting Period | 3.9 |
2010 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares of common stock reserved for issuance (in shares) | 400,000 |
Restricted stock granted (in shares) | 19,727 |
2011 Plan [Member] | 4 Years [Member] | Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 | 4.0 |
Restricted stock granted (in shares) | 1,500 |
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Award Vesting Period | 2.6 |
2011 Plan [Member] | 5 Years [Member] | Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 | 5.0 |
Restricted stock granted (in shares) | 5,500 |
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Award Vesting Period | 3.6 |
2012 Plan [Member] | 3 Years [Member] | Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 | 3.0 |
Restricted stock granted (in shares) | 2,027 |
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Award Vesting Period | 2.7 |
2012 Plan [Member] | 4 Years [Member] | Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 | 4.0 |
Restricted stock granted (in shares) | 2,704 |
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Award Vesting Period | 3.7 |
2012 Plan [Member] | 5 Years [Member] | Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 | 5.0 |
Restricted stock granted (in shares) | 7,996 |
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Award Vesting Period | 4.7 |
1995 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted in 1995 (in shares) | 600,000 |
Term of options, maximum (in years) | 10Y |
Percentage of options vesting two years (in hundredths) | 50.00% |
Vesting term, option one (in years) | 2Y |
Percentage of options vesting five years (in hundredths) | 50.00% |
Vesting term, option two (in years) | 5Y |
Summary of status and changes of Stock Option Plan [Roll Forward] |  |
Granted in 2012 (in shares) | 600,000 |

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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date. + 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 + Details
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- Definition The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(e) -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(f) -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e)(1) -SubTopic 10 -Topic 718 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 + Details
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