SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - Deferred Tax Assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 201,422	$ 156,084	$ 64,987
(Deductions) Additions Charged to Costs and Expenses	70,063	24,706	91,097
Additions Charged to Other Accounts	0	21,536	0
Deductions	(9,093)	(904)	0
Balance at End of Period	$ 262,392	$ 201,422	$ 156,084