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OTHER INCOME (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Unrealized Gain (Loss) on Investments $ 0 $ 58 $ 2,342 $ 57
Amortization of Prepaid Royalty Discount 320 472 779 1,083
Interest income 842 956 1,253 1,564
Building rental income 609 258 971 498
Other income (expense) 126 648 (40) 1,514
Nonoperating Income (Expense) $ 3,049 3,259 $ 6,954 5,576
Equity Method Investment, Ownership Percentage 21.43%   21.43%  
Wheels India [Member]        
Income (Loss) from Equity Method Investments $ 1,152 $ 867 $ 1,649 $ 860
Equity Method Investment, Ownership Percentage 34.23%   34.23%