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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Summary of changes in shareholders' equity |  |  |  |
Balance |  |  | $ 488,912 | $ 499,995
Balance, shares | 40,653,337 |  | 40,653,337 |
Net income/(loss) | 8,005 | 562 | 3,251 | (6,097)
Exercise of stock options |  |  | 1,222 | 1,798
Exercise of stock options, shares | 10,600 | 19,550 | 79,300 | 116,600
Equity award compensation expense |  |  | 3,273 | 3,101
Issuance of restricted stock |  |  | 0 | 0
Balance | 496,658 | 498,797 | 496,658 | 498,797
Balance, shares |  |  | 40,377,021 |
Common Stock [Member] |  |  |  |
Summary of changes in shareholders' equity |  |  |  |
Balance |  |  | 404 | 400
Balance, shares | 40,653,000 | 40,301,000 | 40,653,000 | 40,301,000
Net income/(loss) |  |  | 0 | 0
Exercise of stock options |  |  | 1 | 1
Exercise of stock options, shares |  |  | 79,000 | 116,600
Equity award compensation expense |  |  | 0 | 0
Issuance of restricted stock, Shares |  |  | 197,000 | 154,000
Issuance of restricted stock |  |  | 2 | 2
Balance | 407 | 403 | 407 | 403
Balance, shares |  |  | 40,377,000 | 40,030,000
Additional Paid In Capital [Member] |  |  |  |
Summary of changes in shareholders' equity |  |  |  |
Balance |  |  | 478,839 | 468,820
Net income/(loss) |  |  | 0 | 0
Exercise of stock options |  |  | 1,221 | 1,797
Equity award compensation expense |  |  | 3,273 | 3,101
Issuance of restricted stock |  |  | (2) | (2)
Balance | 483,331 | 473,716 | 483,331 | 473,716
Retained Earnings [Member] |  |  |  |
Summary of changes in shareholders' equity |  |  |  |
Balance |  |  | 198,442 | 219,548
Net income/(loss) |  |  | 3,251 | (6,097)
Exercise of stock options |  |  | 0 | 0
Equity award compensation expense |  |  | 0 | 0
Issuance of restricted stock |  |  | 0 | 0
Balance | 201,693 | 213,451 | 201,693 | 213,451
Treasury Stock [Member] |  |  |  |
Summary of changes in shareholders' equity |  |  |  |
Balance |  |  | (188,773) | (188,773)
Net income/(loss) |  |  | 0 | 0
Exercise of stock options |  |  | 0 | 0
Equity award compensation expense |  |  | 0 | 0
Issuance of restricted stock |  |  | 0 | 0
Balance | $ (188,773) | $ (188,773) | $ (188,773) | $ (188,773)

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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