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OTHER INCOME (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Other Income and Expenses [Abstract]        
Income (Loss) from Equity Method Investments $ 800 $ 515 $ 2,449 $ 1,375
Gain (Loss) on Disposition of Assets 0 255 2,342 312
Interest Income, Other 929 452 2,182 2,016
Rental Income, Nonoperating 557 253 1,528 751
Amortization of Prepaid Royalty Discount 389 458 1,168 1,541
Gain (Loss) on Investments 560 (973) 52 (639)
Other Nonoperating Income 343   811 975
Other Nonoperating Expense   (205)    
Nonoperating Income (Expense) $ 3,578 $ 755 $ 10,532 $ 6,331