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QUARTERLY FINANCIAL DATA (UNAUDITED) (NARRATIVE) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Non-cash loss on assets held-for-sale |  |  |  |  |  |  |  |  |  |  | $ 2,578
Other than Temporary Impairment Losses, Investments |  |  |  |  |  |  |  | $ 15,600 | $ 0 | $ 15,632 | 0
Gain on sale of business |  |  |  |  |  |  |  | 700 | 0 | 0 | 908
Interest Expense. |  |  |  |  |  |  |  |  | 19,113 | 28,674 | 13,734
Tax contingent liabilities | $ 200 | $ 200 | $ 100 | $ 200 | $ 3,600 | $ 1,100 | $ 1,000 |  | 200 | 3,600 |
Transition tax |  |  |  |  |  |  |  |  |  |  | 61,569
Benefit to Income Taxes Related to Restructuring Charges |  |  | 200 | 700 | 500 | 700 | 200 | 600 |  |  |
Net Change in Valuation Allowance | 2,200 |  | 2,300 |  | 1,500 |  |  |  |  |  |
Expense to income taxes related to disposition of assets |  |  |  |  | 100 | 100 | 100 | 200 |  |  |
Tax Adjustments, Settlements, and Unusual Provisions | 1,600 | 200 | 100 | 100 | 3,000 | 200 | 500 |  |  |  |
Decrease (increase) - change in tax rate | 2,800 |  |  |  |  |  |  |  | (2,848) | (1,944) | $ 1,101
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses | 4,142 |  |  |  | 4,221 |  |  | 4,200 | $ 4,142 | $ 4,221 |
Excess tax benefit from equity-based awards |  |  |  |  |  | 400 | 200 | 100 |  |  |
Net change in income tax other reconciling items | 100 | 200 | 100 | 100 |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent |  |  |  |  |  |  |  |  | 22.90% | 25.60% |
Motif [Member] |  |  |  |  |  |  |  |  |  |  |
Interest Expense. | $ 2,100 | $ 800 | $ 500 | $ 1,300 | $ 1,900 | $ 3,000 | $ 3,100 | $ 1,900 |  |  |

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