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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Summary of changes in shareholders' equity |  |  |  |  |
Balance |  |  | $ 488,912 |  | $ 499,995
Balance, shares | 35,590,401 |  | 35,590,401 |  |
Net income/(loss) | 6,784 | (3,235) | 10,035 |  | (9,332)
Exercise of stock options |  |  | 3,900 |  | 1,831
Exercise of stock options, shares | 179,832 | 3,000 | 259,132 |  | 119,600
Equity award compensation expense |  |  | 6,095 |  | 5,215
Issuance of restricted stock |  |  | 0 |  | 0
Issuance of stock, shares | 2,645,000 |  |  |  |
Issuance of stock, value |  |  | 87,125 | [1] |
Cancellation of treasury shares, value |  |  | 0 | [2] |
Balance | 596,067 | 497,709 | 596,067 |  | 497,709
Balance, shares |  |  | 40,377,021 |  |
Common Stock [Member] |  |  |  |  |
Summary of changes in shareholders' equity |  |  |  |  |
Balance |  |  | 404 |  | 400
Balance, shares | 35,590,000 | 40,316,000 | 35,590,000 |  | 40,316,000
Net income/(loss) |  |  | 0 |  | 0
Exercise of stock options |  |  | 3 |  | 1
Exercise of stock options, shares |  |  | 259,000 |  | 119,000
Equity award compensation expense |  |  | 0 |  | 0
Issuance of restricted stock, shares |  |  | 200,000 |  | 167,000
Issuance of restricted stock |  |  | 2 |  | 2
Issuance of stock, shares |  |  | 2,645,000 | [1] |
Issuance of stock, value |  |  | 26 | [1] |
Cancellation of treasury shares (shares) |  |  | (7,891,000) | [2] |
Cancellation of treasury shares, value |  |  | (79) | [2] |
Balance | 356 | 403 | 356 |  | 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 |  |  | 3,897 |  | 1,830
Equity award compensation expense |  |  | 6,095 |  | 5,215
Issuance of restricted stock |  |  | (2) |  | (2)
Issuance of stock, value |  |  | 87,099 | [1] |
Cancellation of treasury shares, value |  |  | (188,694) | [2] |
Balance | 387,234 | 475,863 | 387,234 |  | 475,863
Retained Earnings [Member] |  |  |  |  |
Summary of changes in shareholders' equity |  |  |  |  |
Balance |  |  | 198,442 |  | 219,548
Net income/(loss) |  |  | 10,035 |  | (9,332)
Exercise of stock options |  |  | 0 |  | 0
Equity award compensation expense |  |  | 0 |  | 0
Issuance of restricted stock |  |  | 0 |  | 0
Issuance of stock, value |  |  | 0 | [1] |
Cancellation of treasury shares, value |  |  | 0 | [2] |
Balance | 208,477 | 210,216 | 208,477 |  | 210,216
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
Issuance of stock, value |  |  | 0 | [1] |
Cancellation of treasury shares, value |  |  | 188,773 | [2] |
Balance | $ 0 | $ (188,773) | $ 0 |  | $ (188,773)
[1] | In July 2012, we issued a public offering of 2,645,000 shares of common stock, par value $0.01 per share, at a price to the public of $34.75 per share.
[2] | During the third quarter of 2012, we canceled and retired all of our treasury shares. These shares remain as authorized and unissued shares.

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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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- Definition Number of shares of common and preferred stock retired from treasury during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: 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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration