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