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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards |  |  |
Income tax benefit related to net operating loss carryforwards | $ 2,700 |  |
Deferred tax assets, tax credit carryforwards | 102,012 | $ 68,787 |
Disallowed interest carryforwards | 56,630 | 28,673 |
Tax credit carryforwards | 131,000 |  |
Increase in valuation allowance | 29,800 |  |
Valuation allowance at end of period | 71,100 |  |
Increase (Decrease) in unrecognized tax benefits, income tax penalties and interest accrued | (1,700) | 100 | $ (100)
Noncurrent income taxes payable, accrued interest and penalties | 1,900 | 3,100 |
Income tax penalties and interest accrued | 46,700 | 55,500 |
Tax positions for which the ultimate deductibility is highly certain but timing is uncertain | 41,800 | $ 51,900 |
Change in unrecognized tax benefits unrelated to Federal income taxes statute of limitations expiring within twelve months of current reporting period | 4,500 |  |
Increase (decrease) in transition tax related to the TCJA |  |  | $ (3,200)
Undistributed earnings of foreign subsidiaries | 158,100 |  |
Federal |  |  |
Operating Loss Carryforwards |  |  |
Net operating loss carryforwards | 501,000 |  |
Net operating loss carryforwards not subject to expiration | 13,800 |  |
Net operating loss carryforwards subject to expiration | 487,200 |  |
Unrestricted operating loss carryforwards | 386,700 |  |
Disallowed interest carryforwards | 206,500 |  |
State |  |  |
Operating Loss Carryforwards |  |  |
Net operating loss carryforwards | 344,700 |  |
Unrestricted operating loss carryforwards | 300,900 |  |
Foreign |  |  |
Operating Loss Carryforwards |  |  |
Net operating loss carryforwards | 116,800 |  |
Disallowed interest carryforwards | 57,100 |  |
Research tax credit carryforward |  |  |
Operating Loss Carryforwards |  |  |
Tax credit carryforwards | 92,800 |  |
General business tax credit carryforward | Foreign |  |  |
Operating Loss Carryforwards |  |  |
Tax credit carryforwards | 38,200 |  |
Carried forward indefinitely | State |  |  |
Operating Loss Carryforwards |  |  |
Net operating loss carryforwards not subject to expiration | 168,400 |  |
Carried forward indefinitely | Foreign |  |  |
Operating Loss Carryforwards |  |  |
Net operating loss carryforwards not subject to expiration | 99,300 |  |
Expires within ten years |  |  |
Operating Loss Carryforwards |  |  |
Tax credit carryforwards | 36,200 |  |
Expires within twenty years |  |  |
Operating Loss Carryforwards |  |  |
Tax credit carryforwards | 59,900 |  |
Expires within twenty years | State |  |  |
Operating Loss Carryforwards |  |  |
Net operating loss carryforwards subject to expiration | 176,300 |  |
Expires within twenty years | Foreign |  |  |
Operating Loss Carryforwards |  |  |
Net operating loss carryforwards subject to expiration | $ 17,500 |  |

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