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LONG-TERM DEBT (Details - Interest Expense and Amortization of Debt Issuance Costs) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Apr. 01, 2014
Debt Instrument [Line Items]            
Line of credit facility, amount outstanding           $ 150,000
Interest expense, debt $ 2,363 $ 2,698 $ 7,060 $ 8,066    
Amortization of debt issuance costs 830 904 2,486 2,459    
Interest paid 1,530 $ 1,720 4,571 $ 5,436    
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Line of credit facility, amount outstanding $ 0   $ 0   $ 0