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SEGMENT AND GEOGRAPHICAL REPORTING, Adjustments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Operating income for reportable segments, excluding impairment expense     $ 153,398
Adjustment for [Abstract]      
B27 settlement $ 7,348 $ 0 0
Impairment expense 68,735 117,569 0
Amortization of intangibles 20,621 22,480 11,830
Total operating income (loss) (27,916) (12,628) 100,924
Interest expense 10,932 12,797 6,282
Other expense (income), net 72 131 (75)
Income (loss) before income taxes (38,920) (25,556) 94,717
Capital expenditures 13,992    
Identifiable assets at year end 683,980 841,632  
Depreciation 12,622 12,598 9,830
Corporate [Member]      
Adjustment for [Abstract]      
Capital expenditures 1,800 800 900
Identifiable assets at year end 23,300 19,300 20,300
Depreciation 1,700 1,400 1,200
Reportable Segment [Member]      
Segment Reporting Information [Line Items]      
Operating income for reportable segments, excluding impairment expense 113,967 172,655 153,398
Segment Reconciling Items [Member]      
Adjustment for [Abstract]      
B27 settlement 7,348 0 0
Impairment expense 68,735 117,569 0
Amortization of intangibles 20,621 22,480 11,830
Corporate and other expense, net $ 45,179 $ 45,234 $ 40,644