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LEASE COMMITMENTS (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Leased Assets [Line Items]      
Rental expense, operating leases $ 7,040us-gaap_OperatingLeasesRentExpenseNet $ 6,521us-gaap_OperatingLeasesRentExpenseNet $ 6,017us-gaap_OperatingLeasesRentExpenseNet
Future minimum rental payments:      
2015 5,711us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 5,484us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 4,657us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 2,298us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 1,388us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 1,461us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total 20,999us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Galveston Office Space [Member]      
Operating Leased Assets [Line Items]      
Annual lease payments $ 175us-gaap_LeaseAndRentalExpense
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdsAndLeaseholdImprovementsMember