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Employee Benefit Plans: (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 28, 2013 | Feb. 01, 1999
401(k) Plan |  |  |  |  |
Employee Benefit Plans: |  |  |  |  |
Number of common stock shares reserved for issuance (in shares) |  |  |  |  | 150,000
Number of additional common stock shares reserved for issuance (in shares) |  |  |  | 500,000 |
Employer match of employee contributions of first 3% of eligible compensation (as a percent) | 100.00% |  |  |  |
Percentage of eligible compensation, matched 100% by employer (as a percent) | 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 (as a percent) | 2.00% |  |  |  |
Employer contribution | $ 3,299 | $ 3,253 | $ 3,017 |  |
Deferred Compensation Plans |  |  |  |  |
Employee Benefit Plans: |  |  |  |  |
Employer contribution | $ 933 | $ 845 | $ 843 |  |

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- Definition Represents the number of additional common shares reserved for future issuance. + References No definition available. + Details
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- Definition Represents the first level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
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- Definition Represents the second level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
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- Definition Represents the employer matching contribution of the first level of employee contributions. + References No definition available. + Details
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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 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=49170846&loc=d3e28014-114942 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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