SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for doubtful accounts
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of period		$ 22,507	$ 23,681
Charged to Costs and Expenses		5,352	1,545
Charged to Other Accounts		(29)	167
Deductions		13,873	(2,886)
Balance at End of Period		41,703	22,507
Inventory reserve
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of period	6,984	6,784	4,824
Charged to Costs and Expenses	(3,141)	(1,185)	(182)
Charged to Other Accounts	9	1,889	1,695
Deductions	2,793	(504)	447
Balance at End of Period	6,645	6,984	6,784
Valuation allowance on deferred tax assets
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of period		1,514,153	1,570,890
Deductions		(28,613)	(56,737)
Balance at End of Period		$ 1,485,540	$ 1,514,153