SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of period	$ 32,847	$ 41,703	$ 22,507
Charged to Costs and Expenses	(1,880)	(5,979)	5,352
Charged to Other Accounts	(294)	179	(29)
Deductions	(3,539)	(3,056)	13,873
Balance at End of Period	27,134	32,847	41,703
Inventory reserve
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of period	6,645	6,984	6,784
Charged to Costs and Expenses	18,469	(3,141)	(1,185)
Charged to Other Accounts	(366)	9	1,889
Deductions	(2,748)	2,793	(504)
Balance at End of Period	22,000	6,645	6,984
Valuation allowance on deferred tax assets
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of period	1,520,852	1,485,540	1,514,153
Charged to Other Accounts	26,589	35,312
Deductions			(28,613)
Balance at End of Period	$ 1,547,441	$ 1,520,852	$ 1,485,540