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Stockholder' Equity (Tables) | 12 Months Ended
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Dec. 31, 2011
Cash Dividends | The Company paid cash dividends during the years ended December 31, 2009, 2010 and 2011 as follows:
|  | Per Share |  |  | Total |
|  |  |  |  | (in thousands) |
2009: |  |  |  |  |  |  |  |
Paid on March 31, 2009 |  | $ | 0.05 |  |  | $ | 7,655 |
Paid on June 30, 2009 |  |  | 0.05 |  |  |  | 7,675 |
Paid on September 30, 2009 |  |  | 0.05 |  |  |  | 7,675 |
Paid on December 30, 2009 |  |  | 0.05 |  |  |  | 7,676 |
Total cash dividends |  | $ | 0.20 |  |  | $ | 30,681 |
2010: |  |  |  |  |  |  |  |
Paid on March 30, 2010 |  | $ | 0.05 |  |  | $ | 7,677 |
Paid on June 30, 2010 |  |  | 0.05 |  |  |  | 7,706 |
Paid on September 30, 2010 |  |  | 0.05 |  |  |  | 7,704 |
Paid on December 30, 2010 |  |  | 0.05 |  |  |  | 7,709 |
Total cash dividends |  | $ | 0.20 |  |  | $ | 30,796 |
2011: |  |  |  |  |  |  |  |
Paid on March 30, 2011 |  | $ | 0.05 |  |  | $ | 7,708 |
Paid on June 30, 2011 |  |  | 0.05 |  |  |  | 7,772 |
Paid on September 30, 2011 |  |  | 0.05 |  |  |  | 7,777 |
Paid on December 30, 2011 |  |  | 0.05 |  |  |  | 7,788 |
Total cash dividends |  | $ | 0.20 |  |  | $ | 31,045 |

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