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DEBT (Schedule of Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument    
Long-term debt $ 190,200  
Capital leases 100 $ 100
Less: unamortized debt issuance costs (300) (300)
Total debt and capital leases 190,000 190,200
Less: current maturities (33,783) (33,715)
Long-term debt 156,170 156,544
Tax increment financing debt    
Debt Instrument    
Long-term debt 21,300 21,800
Foreign subsidiary debt    
Debt Instrument    
Long-term debt 3,900 3,600
Prudential    
Debt Instrument    
Long-term debt 90,000 90,000
New York Life Investors LLC    
Debt Instrument    
Long-term debt $ 75,000 $ 75,000