SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of period	$ 23,545	$ 27,134	$ 32,847
Charged to Costs and Expenses	36,720	(802)	(1,880)
Charged to Other Accounts	(288)	(52)	(294)
Deductions	(12,429)	(2,735)	(3,539)
Balance at End of Period	47,548	23,545	27,134
Inventory Valuation Reserve
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of period	45,141	6,801	6,645
Charged to Costs and Expenses	9,485	43,076	3,270
Charged to Other Accounts			(366)
Deductions	(7,813)	(4,736)	(2,748)
Balance at End of Period	46,813	45,141	6,801
Valuation Allowance of Deferred Tax Assets
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of period	1,537,507	1,547,441	1,520,852
Charged to Other Accounts	(9,934)	(9,934)	26,589
Balance at End of Period	$ 1,527,573	$ 1,537,507	$ 1,547,441