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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Defined Contribution Plans) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Defined Contribution Plan |  |  |
Minimum percentage of eligible compensation that may be invested by all U.S. employees covered under the plan (as a percent) | 1.00% |  |
Employer match of employee contributions of first 6% of eligible compensation (as a percent) | 35.00% |  |
Percentage of eligible compensation, matched 35% by employer (as a percent) | 6.00% |  |
Percentage of base pay as additional annual Company contribution to participants hired after November 1, 1997 (as a percent) | 2.00% |  |
Annual costs recognized for defined contribution plans | $ 10,082 | $ 11,088 | $ 10,812
Minimum |  |  |
Defined Contribution Plan |  |  |
Percentage of base pay as additional annual Company contribution to participants hired after November 1, 1997 (as a percent) | 4.00% |  |
Maximum |  |  |
Defined Contribution Plan |  |  |
Percentage of base pay as additional annual Company contribution to participants hired after November 1, 1997 (as a percent) | 10.00% |  |

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- Definition Minimum percentage of eligible compensation that may be invested by all U.S. employees who are covered under the 401(k) savings plan. + 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 employer matching contribution of the first level of employee contributions. + References No definition available. + Details
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- Definition Represents the employer additional matching contributions to a defined contribution plan for participants employer after certain date. + References No definition available. + Details
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- References No definition available. + 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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