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Industry Segments (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Corporate Overhead Footnote |  |  |  |
General and administrative expense | $ 13,440 | $ 8,821 | $ 33,978 | $ 30,279
Depreciation and amortization | 230 | 394 | 743 | 1,475
Interest expense | 4,011 | 4,969 | 13,423 | 14,110
Other general corporate (income) expense, net | 585 | 1,683 | 1,959 | 2,963
Total | $ 18,266 | $ 15,867 | $ 50,103 | $ 48,827

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