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OTHER INCOME (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Other Income and Expenses [Abstract]        
Interest Income, Other $ 801 $ 842 $ 1,774 $ 1,253
Income (Loss) from Equity Method Investments 530 1,086 1,350 1,583
Gain (Loss) on Investments 497 (291) 1,347 (508)
Rental Income, Nonoperating 595 609 1,195 971
Amortization of Prepaid Royalty Discount 181 320 509 779
Gain (Loss) on Disposition of Assets 70 0 (192) 2,342
Other Nonoperating Income (Expense) (466) 483 (626) 534
Nonoperating Income (Expense) $ 2,208 $ 3,049 $ 5,357 $ 6,954