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Stockholders' Equity (Details 2) (USD $) | 3 Months Ended | 73 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 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 | 37,059,000 | 36,965,000 |  |
Effect of using weighted average common shares outstanding | 8,000 | 91,000 |  |
Shares used in computing earnings per share - basic | 37,067,000 | 37,056,000 |  |
Effect of shares issuable under stock option plans based on the treasury stock method | 92,000 |  |  |
Effect of contingently issuable restricted shares | 174,000 |  |  |
Shares used in computing earnings per share - diluted | 37,333,000 | 37,056,000 |  |
Number of shares of unvested contingently issuable restricted stock outstanding | 200,000 | 400,000 | 200,000 |
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 | 1,000,000
Maximum number of shares of common stock repurchased | 100,000 |  |  |
Number of shares of common stock repurchased |  |  | 5,900,000 |
Average price (in dollars per share) | $ 12.41 |  | $ 10.93 |

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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 45 -Paragraph 48 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2538-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 30, 31, 32, 33, 34, 35, 171 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: 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 Reference 4: 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 5: 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 + Details
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