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Industry Segments (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Corporate Overhead Footnote |  |  |  |
General and administrative expense | $ 10,064 | $ 10,364 | $ 21,458 | $ 20,275
Depreciation and amortization | 527 | 579 | 1,081 | 1,160
Interest expense | 4,610 | 4,090 | 9,141 | 8,242
Other general corporate (income) expense, net | 718 | 632 | 1,280 | 1,194
Total | $ 15,919 | $ 15,665 | $ 32,960 | $ 30,871

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