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CUSTOMER CONTRACTS AND OTHER INTANGIBLE ASSETS (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Estimated amortization expense for the existing carrying amount of customer contracts and other intangible assets  
2013 $ 24,478
2014 21,497
2015 18,846
2016 16,080
2017 $ 14,444