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Common Stock Options (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | May 04, 2013 | Apr. 28, 2012 | Aug. 25, 2010 2002 Equity Incentive Plan [Member] | May 04, 2013 2002 Equity Incentive Plan [Member] | Jul. 24, 2012 2002 Equity Incentive Plan [Member] | May 04, 2013 Restricted Shares [Member] | Feb. 02, 2013 Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock options and restricted shares available for grant (shares) |  |  |  |  |  | 7,600,000 |  |
Stock option maximum term (years) |  |  |  |  | 10 years |  |  |
Vesting period from the date of grant (years) | 2 years |  |  |  | 4 years |  |  |
Shares available for issuance (shares) |  |  |  |  | 4,873,709 |  |  |
Period following board of directors resolution for exercise of options outstanding (days) |  |  |  | 20 days |  |  |  |
Deposit liability |  |  |  |  |  |  | $ 228,000 | $ 308,000
Weighted average grant-date fair value of stock options granted (dollars per share) |  | $ 18.15 | $ 4.36 |  |  |  |  |
Unrecognized compensation costs related to non-vested share-based compensation |  | $ 13,300,000 |  |  |  |  |  |
Unrecognized compensation costs related to nonvested share-based compensation, recognition period (years) |  | 2 years |  |  |  |  |  |

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Deposit Liability Ending Balance + References No definition available. + Details
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- Definition As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -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 FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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