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Segment Information (Schedule Of Reconciliation Of Net Income (Loss) To EBITDA) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Information [Abstract]        
Net income (loss) $ 3,751 $ (11,796) $ (15,704) $ (10,145)
Interest expense 22,021 19,430 44,149 37,926
Income tax benefit (10,753) (9,749) (16,780) (12,130)
Depreciation and amortization 26,823 26,188 53,297 52,271
EBITDA $ 41,842 $ 24,073 $ 64,962 $ 67,922