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STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 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 | $ 31 | $ 129 | $ 3,227 | $ 3,916
Restricted Stock Awards |  |  |  |
Summary of Stock-Based Compensation Plans |  |  |  |
Compensation expense related to restricted stock awards | $ 4,050 | $ 3,637 | $ 11,702 | $ 10,382
Restricted Stock Awards | Ratably |  |  |  |
Summary of Stock-Based Compensation Plans |  |  |  |
Vesting period |  |  | 3 years |
Restricted Stock Awards | Cliff | Minimum |  |  |  |
Summary of Stock-Based Compensation Plans |  |  |  |
Vesting period |  |  | 3 years |
Restricted Stock Awards | Cliff | Maximum |  |  |  |
Summary of Stock-Based Compensation Plans |  |  |  |
Vesting period |  |  | 5 years |
Restricted Stock Awards | Fourth year of employment | Minimum |  |  |  |
Summary of Stock-Based Compensation Plans |  |  |  |
Vesting rights (percent) |  |  | 50.00% |
Restricted Stock Awards | Fifth year of employment | Minimum |  |  |  |
Summary of Stock-Based Compensation Plans |  |  |  |
Vesting rights (percent) |  |  | 50.00% |

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