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Stockholders' Equity (Details Textual) (USD $) | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  |
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Dec. 31, 2011 | Dec. 31, 2011 Qualified Stock Option Plans [Member] | Dec. 31, 2010 Qualified Stock Option Plans [Member] | Dec. 31, 2011 Non-Qualified Stock Option Plans [Member] | Dec. 31, 2010 Non-Qualified Stock Option Plans [Member] | Dec. 31, 2011 Preferred Share Rights Plan [Member] | Dec. 31, 2011 Other [Member] | Dec. 31, 2010 Other [Member] | Dec. 31, 2009 Other [Member] | Dec. 31, 2011 2008 Plan [Member] | Dec. 31, 2011 2008 Plan [Member] Qualified Stock Option Plans [Member] | Dec. 31, 2011 2008 Plan [Member] Non-Qualified Stock Option Plans [Member] | Dec. 31, 2011 1998 Plan [Member] | Jun. 14, 2007 2006 Options [Member] Non-Qualified Stock Option Plans [Member] | Dec. 31, 2011 Outside Director Plan [Member] Non-Qualified Stock Option Plans [Member]
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum exercise price of stock option at grant date |  |  |  |  |  |  |  |  |  | no less than 100% of fair market value at the grant date |  |  |  |  |
Percentage of fair market value |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Maximum term of stock options |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Qualified and non qualified options vest at a percentage rate for first 5 years |  |  |  |  |  |  |  |  |  | 16.50% |  |  |  |  |
Qualified and non qualified options final year vesting |  |  |  |  |  |  |  |  |  | End of the sixth year |  |  |  |  |
Exercisable period Non-qualified option following termination event |  |  |  |  |  |  |  |  |  | Fully vested and excersable for period of one year from the date of the termination event |  |  |  |  |
Exercisable period after termination |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Total stock based compensation expense not yet recognized, relating to non-vested stock options |  |  |  |  |  |  |  |  |  | $ 7,931,000 |  |  |  |  |
Stock option plans, options outstanding |  | 516,330 | 389,026 | 316,525 | 374,600 |  |  |  |  | 505,330 |  | 41,525 | 11,000 |  | 0
Stock options available for grant |  |  |  |  |  |  |  |  |  | 344,370 |  |  |  |  | 280,000
Number of common stock shares for issuance |  |  |  |  |  |  |  |  |  | 1,000,000 | 249,000 | 5,000 |  | 450,000 | 400,000
Exercise price of Options |  | $ 8.85 |  | $ 7.97 |  |  |  |  |  |  |  |  |  | $ 8.01 |
Minimum percentage of ownership of common stock required to exercise preferred share rights |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |
Series 4 Junior participating preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of preferred Stock |  |  |  |  |  | 47.75 per one one-hundredth of a share |  |  |  |  |  |  |  |  |
Preferred share right plan description |  |  |  |  |  | If a person or group acquires 15% or more of our common stock, each Right will entitle the holder (other than the person or group that triggered the Rights being exercisable) to purchase shares of our common stock (or, in certain circumstances, cash or other securities) having a market value of twice the exercise price of a Right at such time |  |  |  |  |  |  |  |  |
Redemption price preferred share rights |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |
Maximum time for redemption after the Rights become exercisable |  |  |  |  |  | 10 days |  |  |  |  |  |  |  |  |
Preferred share right exchange ratio |  |  |  |  |  | one common share per Right |  |  |  |  |  |  |  |  |
Minimum percentage of beneficial ownership of common stock to end preferred share rights exchange |  |  |  |  |  | Until the person triggering the Rights becomes the benefical owner of 50% or more of the entity's common stock. |  |  |  |  |  |  |  |  |
Number of shares of treasury stock purchased |  |  |  |  |  |  | 0 | 177,100 | 275,900 |  |  |  |  |  |
Average price of treasury stock |  |  |  |  |  |  | $ 0.00 | $ 13.67 | $ 11.60 |  |  |  |  |  |
Number of shares converted |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |
Stock Options Exercisable, Shares Exercisable |  |  |  |  |  |  |  |  |  |  |  | 16,325 |  |  |
Date of approval of stock incentive plan | Jun. 05, 2008 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of historical volatility of common stock | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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