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VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowance for doubtful accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 13,497us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 $ 9,110us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 $ 8,093us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember
Charged to Costs and Expenses 2,280us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 8,815us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 1,784us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember
Net (Deductions) Recoveries (426)us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [1] (4,428)us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [1] (767)us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 [1]
Balance at End of Period 15,351us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 13,497us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember		 9,110us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForDoubtfulAccountsMember
Deferred tax asset valuation allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 83us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember		 1,003us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember		 1,295us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Charged to Costs and Expenses         
Net (Deductions) Recoveries (81)us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember		 [2] (920)us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember		 [2] (292)us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember		 [2]
Balance at End of Period $ 2us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember		 $ 83us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember		 $ 1,003us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
[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.