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Segments and Related Information (Reconciliation of EBITDA to Consolidated Income from Continuing Operations before Income Taxes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
EBITDA Reconciliation: |  |  |  |
EBITDA - Continuing operations | $ 67,800 | $ 134,200 | $ 164,400 | $ 303,600
Interest expense, net | (11,964) | (12,643) | (35,845) | (37,595)
Depreciation and amortization | (42,196) | (41,747) | (128,048) | (111,996)
Income from continuing operations before income taxes | $ 13,639 | $ 79,764 | $ 522 | $ 154,016

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