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Employee Benefit Plans: (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2012 401(k) Plan | Dec. 31, 2011 401(k) Plan | Dec. 31, 2010 401(k) Plan | Feb. 01, 1999 401(k) Plan | Jan. 31, 2013 401(k) Plan Subsequent event | Dec. 31, 2012 Deferred Compensation Plans | Dec. 31, 2011 Deferred Compensation Plans | Dec. 31, 2010 Deferred Compensation Plans
Employee Benefit Plans: |  |  |  |  |  |  |  |
Number of common stock shares reserved for issuance |  |  |  | 150,000 |  |  |  |
Employer match of employee contributions of first 3% of eligible compensation (as a percent) | 100.00% |  |  |  |  |  |  |
Number of additional common stock shares reserved for issuance |  |  |  |  | 500,000 |  |  |
Percentage of eligible compensation, matched 100% by employer | 3.00% |  |  |  |  |  |  |
Employer match of employee contributions of next 2% of eligible compensation (as a percent) | 50.00% |  |  |  |  |  |  |
Percentage of eligible compensation, matched 50% by employer | 2.00% |  |  |  |  |  |  |
Employer contribution | $ 3,094 | $ 3,077 | $ 3,502 |  |  | $ 648 | $ 570 | $ 586

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -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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