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
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 8,093		$ 8,694		$ 3,210
Charged to Costs and Expenses	1,784		2,868		4,812
Net (Deductions) Recoveries	(767)	[1]	(3,469)	[1]	672	[1]
Balance at End of Period	9,110		8,093		8,694
Deferred tax asset valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1,295		1,295		1,550
Charged to Costs and Expenses
Net (Deductions) Recoveries	(292)	[2]			(255)	[2]
Balance at End of Period	$ 1,003		$ 1,295		$ 1,295

[1] Net (deductions) recoveries in the allowance for doubtful accounts principally reflect the write-off of previously reserved accounts net of recoveries.

[2] The valuation allowance for deferred tax assets is increased or decreased each year to reflect the state net operating losses that management believes will not be utilized before they expire.