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INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax [Line Items] |  |  |
Change in effective income tax rate during the period | (71.20%) |  |
Effective income tax rate reconciliation, share-based compensation, excess tax benefit, amount | $ 3,800 |  |
Amount of unrecorded benefit expected to be recognized | 700 |  |
Effective income tax rate reconciliation, foreign income tax rate differential, increase (decrease), amount | $ 800 | $ (2,300) | $ (1,200)
Effective foreign income tax rate | 12.70% | 10.60% | 4.90%
Change in effective foreign income tax rate during period | 2.10% | (5.70%) | (39.60%)
Undistributed earnings of foreign subsidiaries | $ 301,300 |  |
Estimated tax liability on undistributed earnings of foreign subsidiaries | 42,500 |  |
Operating loss carryforwards, not subject to expiration | 21,700 |  |
Less valuation allowance | 3,604 | $ 4,887 | $ 6,800
Deferred tax assets, gross | 79,230 | 82,481 | 91,100
Valuation allowances and reserves, period increase (decrease) | (1,300) | $ (1,900) |
Unrecognized tax benefits that would impact effective tax rate | 800 |  |
Benefit for income tax penalties and interest expense |  |  | 200
Penalties and interest accrued |  |  | $ 100
Accounting Standards Update 2016-09 |  |  |
Income Tax [Line Items] |  |  |
Effective income tax rate reconciliation, share-based compensation, excess tax benefit, amount | 1,400 |  |
Tax benefit, Federal research credit study | 500 |  |
Internal Revenue Service (IRS) |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 28,500 |  |
Foreign Tax Authority |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 24,200 |  |
Operating loss carryforwards, subject to expiration | 2,500 |  |
State and Local Jurisdiction |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | $ 14,000 |  |

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