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STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Summary of Stock-Based Compensation Plans |  |  |  |
Stock options issued (in shares) | 0 | 0 | 0 | 0
Net tax benefit recognized in equity for stock compensation plans | $ 51 | $ 79 | $ 3,196 | $ 3,787
Restricted Stock Awards |  |  |  |
Summary of Stock-Based Compensation Plans |  |  |  |
Compensation expense related to restricted stock awards | $ 3,698 | $ 3,565 | $ 7,652 | $ 6,745
Restricted Stock Awards | Minimum |  |  |  |
Summary of Stock-Based Compensation Plans |  |  |  |
Vesting period |  |  | 3 years |
Restricted Stock Awards | Maximum |  |  |  |
Summary of Stock-Based Compensation Plans |  |  |  |
Vesting period |  |  | 5 years |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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