OTHER INCOME/(EXPENSE) (Schedule of Other Nonoperating Income (Expense)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment income:
Interest	$ 1,183	$ 534	$ 219
Gain/(loss) on sale or write-down of securities and investments	0	46	53
Investment income interest and dividend and gain loss on investments	1,183	580	272
Loss on repurchase of debt	(3,237)	(2,988)	(26,516)
Performance fees	135	0	0
Miscellaneous-net	38	17	5
Other Income (Expense)	$ (1,881)	$ (2,391)	$ (26,239)