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Industry Segments (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Corporate Overhead Footnote |  |
General and administrative expense | $ 8,850 tti_Corporategeneralandadministrativeexpense | $ 11,394 tti_Corporategeneralandadministrativeexpense
Depreciation and amortization | 253 tti_Corporatedepreciationdepletionamortizationandaccretion | 554 tti_Corporatedepreciationdepletionamortizationandaccretion
Interest expense | 4,997 tti_Corporateinterestexpense | 4,531 tti_Corporateinterestexpense
Other general corporate (income) expense, net | 463 tti_Corporateothernonoperatingincomeexpense | 562 tti_Corporateothernonoperatingincomeexpense
Total | $ 14,563 tti_Totalcorporateoverheadperiod | $ 17,041 tti_Totalcorporateoverheadperiod

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