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Stock-Based Compensation (Details Textual) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 Plan | Dec. 31, 2011 | Dec. 31, 2010
Stock-based compensation (Textual) [Abstract] |  |  |
Equity Incentive Plans | 2 |  |
Shares authorized | 75,000,000 | 75,000,000 |
Total unrecognized compensation expense | $ 2,322,000 |  |
Vesting period | 1 year 8 months 12 days |  |
Term of years | 6 years 4 months 24 days | 7 years 4 months 24 days | 7 years 2 months 12 days
Vesting period of grant date | 1 year |  |
Estimated fair value per share of options granted | $ 0.00 | $ 5.31 | $ 8.40
Intrinsic value of options at time of exercise | 4,319 | 11,293 | 13,418
Number of restricted unit vest over next fiscal year | 75,000 |  |
Number of restricted unit would vest over vesting period | 536,000 |  |
Exercise price | $ 21.06 |  |
Restricted stock unit vest description | 536,000 and 747,000 of these restricted stock units vest and convert into shares of our common stock over a three and four year period from the date of grant: one-third and one-fourth of the award will vest on each grant date anniversary following the grant. |  |
Options [Member] |  |  |
Stock-based compensation (Textual) [Abstract] |  |  |
Vesting period | 4 years |  |
Percentage of vested grant date | 25.00% |  |
Percentage of vested grant date | 75.00% |  |
Unexercised vested option forfeiture | 3 months |  |
Estimated fair value | 627,000 | 1,545,000 | 2,179,000
Options [Member] | Maximum [Member] |  |  |
Stock-based compensation (Textual) [Abstract] |  |  |
Term of years | 10 years |  |
Restricted Stock [Member] |  |  |
Stock-based compensation (Textual) [Abstract] |  |  |
Percentage of vested grant date | 25.00% |  |
Vesting period of grant date | 4 years |  |
Number Of Restricted Stock Unit Vest Over Four Years From Grant Date | 747,000 |  |
Restricted Stock [Member] | Maximum [Member] |  |  |
Stock-based compensation (Textual) [Abstract] |  |  |
Term of years | 10 years |  |
Vesting period of grant date | 3 years |  |
Restricted Stock [Member] | Minimum [Member] |  |  |
Stock-based compensation (Textual) [Abstract] |  |  |
Vesting period of grant date | 1 year |  |
Stock Appreciation Rights (SARs) [Member] |  |  |
Stock-based compensation (Textual) [Abstract] |  |  |
Percentage of vested grant date | 25.00% |  |
Percentage of vested grant date | 75.00% |  |
Vesting period of grant date | 3 years |  |
Liability related to the SARs | 18,000 | 265,000 | 344,000
SAR Stock appreciation right, compensation liability re measured value | $ 17,000 |  |
Restricted Stock One [Member] |  |  |
Stock-based compensation (Textual) [Abstract] |  |  |
Restricted stock units vest and convert into shares of our common stock | 1 year |  |
Restricted Stock Two [Member] |  |  |
Stock-based compensation (Textual) [Abstract] |  |  |
Restricted stock units vest and convert into shares of our common stock | 3 years |  |
Award vest on each grant date anniversary | 33.3333% |  |
Restricted Stock Three [Member] |  |  |
Stock-based compensation (Textual) [Abstract] |  |  |
Restricted stock units vest and convert into shares of our common stock | 4 years |  |
Award vest on each grant date anniversary | 25.00% |  |
Equity incentive plans [Member] |  |  |
Stock-based compensation (Textual) [Abstract] |  |  |
Shares authorized | 593,199 |  |
Annual increase in number of shares of common stock | 4.00% |  |
Aggregate limit of shares issuable to incentive stock option awards | 3,000,000 |  |

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