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INCOME TAXES - Income Tax Provision (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |
Federal | $ 76,178 | $ 69,102 | $ 68,667
State | 13,406 | 12,949 | 11,335
Foreign | 7,158 | 14,464 | 7,534
Total current tax | 96,742 | 96,515 | 87,536
Deferred: |  |  |
Federal | 17,249 | (5,991) | 1,286
State | 1,610 | 2,892 | 2,078
Foreign | (223) | (149) | 129
Total deferred tax | 18,636 | (3,248) | 3,493
TOTAL PROVISION FOR INCOME TAXES | 115,378 | 93,267 | 91,029
Reconciliation of primary factors causing income tax expense to be different than the federal statutory rate |  |  |
Income tax at statutory rate | 103,075 | 91,222 | 85,112
State income tax expense (net of federal benefit) | 9,979 | 8,876 | 8,377
Foreign tax expense/(benefit) | (1,613) | 9,857 | (1,729)
Foreign tax | (221) | (19,155) | (2,816)
Repatriation tax under TCJA | 7,956 | 0 | 0
Other | (3,798) | 2,467 | 2,085
TOTAL PROVISION FOR INCOME TAXES | $ 115,378 | $ 93,267 | $ 91,029
Effective income tax rate | 39.20% | 35.80% | 37.40%
Income taxes paid net of refunds | $ 90,702 | $ 88,766 | $ 82,690

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