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INCOME TAXES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current provision: |  |  |
U.S. Federal | $ 248,090 | $ 310,582 | $ 412,545
U.S. State | 28,693 | 38,249 | 49,894
Foreign | 22,057 | 25,076 | 24,087
Total current | 298,840 | 373,907 | 486,526
Deferred tax provision (benefit) | 14,041 | 12,313 | (20,995)
Income tax expense | 312,881 | $ 386,220 | $ 465,531
Operating loss carryforwards related primarily from foreign operations | $ 285,000 |  |
Reduction to the overall effective tax rate from income tax credits (as a percent) | 4.00% | 2.80% | 1.00%
Net provisional benefit primarily related to deferred tax balances revaluations and one-time transition tax | $ 3,200 |  |
Net provisional benefit from remeasurement of deferred tax assets and liabilities | 5,200 |  |
One-time transition tax and recognized net provisional expense | 2,000 |  |
Estimated tax obligation | 47,000 |  |
Previously deferred U.S. income taxes | 472,000 |  |
Estimated foreign tax credits | 45,000 |  |
Undistributed earnings of foreign subsidiaries | 472,000 |  |
Accrued interest and penalties related to tax uncertainties | 5,000 | $ 4,000 | $ 5,000
Liability for tax uncertainties | 21,000 | 22,000 |
Interest expense | $ 1,000 | $ 1,000 | $ 1,000

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