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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)