VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		$ 15,351	$ 13,497	$ 9,110
Charged to Costs and Expenses		(2,958)	2,280	8,815
Net (Deductions) Recoveries	[1]	(1,788)	(426)	(4,428)
Balance at End of Period		10,605	15,351	13,497
Deferred tax asset valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		2	$ 83	$ 1,003
Charged to Costs and Expenses		$ 274
Net (Deductions) Recoveries	[2]		$ (81)	$ (920)
Balance at End of Period		$ 276	$ 2	$ 83

[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.