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INCOME TAXES - Effective income tax rate (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Effective income tax rate          
Provision for income taxes at federal statutory rate (as a percent) 21.00% 28.10% 35.00% 35.00% 35.00%
Research and development tax credits (as a percent)   (1.40%)   (2.50%) (1.80%)
Foreign income subject to tax at other than federal statutory rate (as a percent)   (4.80%)   (20.00%) (8.90%)
Stock compensation excess tax benefit (as a percent)   (8.80%)   (9.50%)  
Change in valuation allowance (as a percent)   19.60%   10.40% 5.80%
Unrecognized tax benefit (as a percent)   (6.80%)   (1.40%) (5.00%)
Meals and entertainment (as a percent)   1.50%   1.80% 0.90%
Tax on foreign currency gains and losses (as a percent)   (0.10%)   9.10% 2.30%
Transaction costs (as a percent)   0.10%   1.50% 2.30%
State tax expense (as a percent)   (1.30%)   (1.50%) (0.30%)
U.S. tax on foreign earnings (as a percent)   2.50%   0.40% 4.50%
Fringe benefits   1.10%   1.50% 0.90%
Non-taxable gain from sale of business (as a percent)       (3.60%)  
Non-taxable earnings from acquisitions (as a percent)   (1.10%)   (1.80%) (7.90%)
Mexico imputed income or expense (as a percent)   (3.50%)   (2.00%) (0.40%)
Remeasurement of U.S. net deferred tax assets from 35% to 21% (as a percent)   16.00%      
Deemed repatriation of non-U.S. earnings (as a percent)   102.20%      
Withholding tax on deemed repatriation foreign earnings (as a percent)   35.80%      
Other (as a percent)   (0.10%)   0.70% (1.10%)
Effective income tax rate (as a percent)   179.00%   18.10% 26.30%