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OTHER INCOME (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Other Income and Expenses [Abstract]    
Interest Income, Other $ 973 $ 411
Gain (Loss) on Investments 850 (217)
Income (Loss) from Equity Method Investments 849 497
Rental Income, Nonoperating 600 362
Amortization of Prepaid Royalty Discount 328 459
Gain (Loss) on Disposition of Assets (262) 2,342
Other Nonoperating Income (Expense) (189) 51
Nonoperating Income (Expense) $ 3,149 $ 3,905