Schedule II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Movement in valuation and qualifying accounts
Bad debt expense, net of recoveries	$ (3,500,000)	$ (5,100,000)	$ (4,300,000)
Allowance for doubtful accounts (deducted from accounts receivable)
Movement in valuation and qualifying accounts
Balance at Beginning of Period	3,083,000	3,345,000	2,464,000
Charged to Costs and Expenses(a)	4,731,000	6,058,000	6,299,000
Deductions	(5,943,000)	(6,320,000)	(5,418,000)
Balance at End of Period	1,871,000	3,083,000	3,345,000
Allowance for Unfulfilled Customer Purchase Obligations (deducted from accounts receivable)
Movement in valuation and qualifying accounts
Balance at Beginning of Period	1,682,000	1,859,000	1,576,000
Charged to Costs and Expenses(a)	4,690,000	6,888,000	4,870,000
Deductions	(4,228,000)	(7,065,000)	(4,587,000)
Balance at End of Period	2,144,000	1,682,000	1,859,000
Deferred tax valuation allowance
Movement in valuation and qualifying accounts
Balance at Beginning of Period	388,460,000	370,293,000	357,915,000
Charged to Costs and Expenses(a)	5,542,000	18,200,000	20,837,000
Deductions	(39,465,000)	(33,000)	(8,459,000)
Balance at End of Period	$ 354,537,000	$ 388,460,000	$ 370,293,000