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Stockholders' Equity (Details 2) (USD $) | 3 Months Ended | 9 Months Ended | 79 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Mar. 29, 2007
Reconciliation of the number of shares outstanding with the number of shares used in computing basic and diluted earnings per share |  |  |  |  |  |
Common shares outstanding, end of period | 37,296,000 | 37,125,000 | 37,296,000 | 37,125,000 |  |
Effect of using weighted average common shares outstanding | (3,000) | 30,000 | (112,000) | 1,000 |  |
Shares used in computing earnings per share - basic | 37,293,000 | 37,155,000 | 37,184,000 | 37,126,000 |  |
Effect of shares issuable under stock option plans based on the treasury stock method | 245,000 | 90,000 | 153,000 | 91,000 |  |
Effect of contingently issuable restricted shares | 93,000 | 87,000 | 107,000 | 48,000 |  |
Shares used in computing earnings per share - diluted | 37,631,000 | 37,332,000 | 37,444,000 | 37,265,000 |  |
Number of shares of unvested contingently issuable restricted stock outstanding | 100,000 | 200,000 | 100,000 | 200,000 | 100,000 |
Share Repurchase Program |  |  |  |  |  |
Number of shares of outstanding common stock authorized to be acquired under a stock repurchase program | 6,600,000 |  | 6,600,000 |  | 6,600,000 | 1,000,000
Number of shares of common stock repurchased |  |  | 100,000 |  | 6,000,000 |
Average price (in dollars per share) |  |  | $ 14.59 |  | $ 11.00 |

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 55 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2626-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 48 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2538-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingently Issuable Shares -URI http://asc.fasb.org/extlink&oid=6508586 + Details
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