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TAXES - Tax Cuts and Jobs Act Bill and Stock-Based Compensation Tax Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reasonable estimate of effect of enactment of Tax Act |  |  |  |  |
U.S. federal corporate tax rate (as a percent) |  |  | 35.00% | 35.00% | 35.00%
Provisional amount for reasonable estimate of effect of Tax Act on existing deferred tax balance | $ 1,500 |  | $ 1,461 |  |
Tax benefits for employee stock-based compensation |  |  |  |  |
Increase to contributed capital from certain tax benefits for employee stock-based compensation |  |  |  | $ 737 | $ 865
Income tax expense (tax benefit) |  |  | 14,161 | $ 13,358 | $ 11,217
Accounting Standards Update 2016-09 |  |  |  |  |
Tax benefits for employee stock-based compensation |  |  |  |  |
Income tax expense (tax benefit) |  |  | $ (1,359) |  |
Expected |  |  |  |  |
Reasonable estimate of effect of enactment of Tax Act |  |  |  |  |
U.S. federal corporate tax rate (as a percent) |  | 21.00% |  |  |

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- Definition Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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