VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		$ 10,605	$ 15,351	$ 13,497
Charged to Costs and Expenses		6,021	(2,958)	2,280
Net (Deductions) Recoveries	[1]	(14,073)	(1,788)	(426)
Balance at End of Period		2,553	10,605	15,351
Deferred tax asset valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		276	2	83
Charged to Costs and Expenses		80	274
Net (Deductions) Recoveries	[2]			(81)
Balance at End of Period		$ 356	$ 276	$ 2

[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.