SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS - Deferred Tax Asset Valuation Allowance (Details) - Deferred Tax Asset Valuation Allowance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Valuation Allowances and Reserves
Balance at Beginning of Period	$ 989,924	$ 944,576	$ 655,658
Charges to Costs, Expenses and other	319,429	109,285	314,098
Reversal	(12,155)	(49,577)	(457)
Adjustments	(344,861)	(14,360)	(24,723)
Balance at End of Period	$ 952,337	$ 989,924	$ 944,576