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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 | $ 11,688 | $ 10,064 | $ 20,537 | $ 21,458
Depreciation and amortization | 254 | 527 | 512 | 1,081
Interest expense | 4,415 | 4,610 | 9,412 | 9,141
Other general corporate (income) expense, net | 914 | 718 | 1,376 | 1,280
Total | $ 17,271 | $ 15,919 | $ 31,837 | $ 32,960

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