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GOODWILL AND INTANGIBLE ASSETS - Expected future annual amortization expense (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
2015 $ 14,491us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 13,637us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 11,960us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 10,383us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 10,372us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 45,340us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total $ 106,183us-gaap_FiniteLivedIntangibleAssetsNet $ 131,108us-gaap_FiniteLivedIntangibleAssetsNet