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SEGMENT AND GEOGRAPHICAL REPORTING, Adjustments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Adjustment for [Abstract]      
B27 settlement $ 0 $ 7,348 $ 0
Impairment expense 0 68,735 117,569
Amortization of intangibles 18,061 20,621 22,480
Total operating income (loss) 19,332 (27,916) (12,628)
Interest expense 15,564 10,932 12,797
Other expense (income), net (5,906) 72 131
Income (loss) before income taxes 9,674 (38,920) (25,556)
Capital expenditures 4,868    
Identifiable assets at year end 611,525 683,980  
Depreciation 11,933 12,622 12,598
Corporate [Member]      
Adjustment for [Abstract]      
Capital expenditures 500 1,800 800
Identifiable assets at year end 18,300 23,300 19,300
Depreciation 1,400 1,700 1,400
Reportable Segment [Member]      
Segment Reporting Information [Line Items]      
Operating income for reportable segments, excluding impairment expense 72,950 113,967 172,655
Segment Reconciling Items [Member]      
Adjustment for [Abstract]      
B27 settlement 0 7,348 0
Impairment expense 0 68,735 117,569
Amortization of intangibles 18,061 20,621 22,480
Corporate and other expense, net $ 35,557 $ 45,179 $ 45,234