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INCOME TAXES - Unrecognized tax benefits (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($)
Activity of unrecognized tax benefits |  |  |  |  |
Balance at the beginning of the year |  | $ 11,195 |  | $ 9,754 |
Additions on tax positions for the current year |  | 294 |  | 594 |
Additions on tax positions from prior years |  | 14 |  | 1,445 |
Reduction in tax positions from prior year |  | (1,005) |  | (598) |
Balance at the end of the year | $ 10,498 | $ 10,498 |  | $ 11,195 | $ 9,754
Recent tax legislation |  |  |  |  |
Income tax rate for foreign cash and other net current assets (as a percent) |  | 0.155 |  |  |
Income tax rate for foreign remaining income (as a percent) |  | 0.08 |  |  |
U.S. federal statutory tax rate (as a percent) | 21.00% | 28.10% | 35.00% | 35.00% | 35.00%
Tax Cuts and Jobs Act of 2017, provisional net charge |  | $ 55,300 |  |  |
Tax Cuts and Jobs Act of 2017, transition tax |  | 35,500 |  |  |
Tax Cuts and Jobs Act of 2017, impact of changes in tax rate |  | 6,600 |  |  |
Tax Cuts and Jobs Act of 2017, charge of foreign withholding taxes on the repatriation of foreign earnings | $ 13,200 | 13,200 |  |  |
Tax Cuts and Jobs Act of 2017, current tax liability for dividends declared | 8,100 | 8,100 |  |  |
Tax Cuts and Jobs Act of 2017, deferred tax liability for withholding taxes on unrepatriated foreign earnings | 5,300 | 5,300 |  |  |
Deferred income tax assets: |  |  |  |  |
Tax credit carryforwards | 17,591 | 17,591 |  | $ 19,005 |
Net operating loss carryforwards | 10,473 | 10,473 |  | 37,689 |
Customer advances | 2,360 | 2,360 |  | 4,028 |
Allowance for doubtful accounts | 4,336 | 4,336 |  | 5,839 |
Inventory reserve | 11,735 | 11,735 |  | 15,933 |
Inventory capitalization | 3,043 | 3,043 |  | 3,977 |
Accrued liabilities | 9,174 | 9,174 |  | 11,511 |
Stock and deferred compensation | 15,779 | 15,779 |  | 24,211 |
Other assets | 3,641 | 3,641 |  | 3,001 |
Total deferred income tax assets | 78,132 | 78,132 |  | 125,194 |
Valuation allowance | (27,007) | (27,007) |  | (19,997) |
Net deferred income tax assets | 51,125 | 51,125 |  | 105,197 |
Deferred income tax liabilities: |  |  |  |  |
Depreciation | (6,322) | (6,322) |  | (21,228) |
State income taxes | (130) | (130) |  | (655) |
Amortization of intangible assets | (31,993) | (31,993) |  | (48,966) |
Withholding tax on unrepatriated foreign earnings | (5,114) | (5,114) |  |  |
State transition tax | (1,754) | (1,754) |  |  |
Convertible debt | (9,198) | (9,198) |  | (17,019) |
Prepaid expenses | (8,680) | (8,680) |  | (2,983) |
Other liabilities | (329) | (329) |  | (130) |
Total deferred income tax liabilities | (63,520) | (63,520) |  | (90,981) |
Net deferred income tax asset |  |  |  | 14,216 |
Net deferred tax liabilities | (12,395) | (12,395) |  |  |
Components of net deferred income tax asset |  |  |  |  |
Long term deferred income tax asset, included in other assets | 2,607 | 2,607 |  | 34,897 |
Long term deferred income tax liability | (15,002) | (15,002) |  | (20,681) |
Net deferred income tax asset |  |  |  | 14,216 |
Net deferred tax liabilities | (12,395) | (12,395) |  |  |
Components of current taxes receivable and payable and prepaid taxes |  |  |  |  |
Current taxes receivable and prepaid taxes, included in prepaid expenses and other current assets | 5,172 | 5,172 |  | 12,100 |
Current taxes payable, included in other accrued expenses and current liabilities | (8,314) | (8,314) |  | (6,454) |
Net tax receivable |  |  |  | $ 5,646 |
Net tax payable | $ (3,142) | $ (3,142) |  |  |

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