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ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Cash equivalents    
Cash equivalents $ 75,200 $ 28,100
Assets:    
Cash equivalents - Money market mutual funds 75,177 28,102
Trading securities held in a "rabbi trust" 58 68
Total assets 75,235 28,170
Liabilities:    
Derivatives 1,816 2,397
Deferred compensation accrual "rabbi trust" 61 70
Total liabilities 1,877 2,467
Level 1    
Assets:    
Cash equivalents - Money market mutual funds 75,177 28,102
Trading securities held in a "rabbi trust" 58 68
Total assets 75,235 28,170
Liabilities:    
Derivatives 0 0
Deferred compensation accrual "rabbi trust" 61 70
Total liabilities 61 70
Level 2    
Assets:    
Cash equivalents - Money market mutual funds 0 0
Trading securities held in a "rabbi trust" 0 0
Total assets 0 0
Liabilities:    
Derivatives 1,816 2,397
Deferred compensation accrual "rabbi trust" 0 0
Total liabilities 1,816 2,397
Level 3    
Assets:    
Cash equivalents - Money market mutual funds 0 0
Trading securities held in a "rabbi trust" 0 0
Total assets 0 0
Liabilities:    
Derivatives 0 0
Deferred compensation accrual "rabbi trust" 0 0
Total liabilities $ 0 $ 0