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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Recurring Financial Assets Carried At Fair Value
   December 31, 2014
   Level 1   Level 2   Level 3 
                
Investment in Global (1)  $9,979   $—     $—   

 

   December 31, 2013
   Level 1   Level 2   Level 3 
                
Investment in Global (1)  $19,312   $—     $—   

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(1)Global’s ordinary shares are publicly traded on the Alternative Investment Market (“AIM”), a market operated by the London Stock Exchange, with quoted prices in active markets. Accordingly, the fair value measurements of these securities have been classified as Level 1.

 

Fair Values and Non-Cash Impairments of Long-Lived Assets

 

   December 31, 2014  December 31, 2013
   Fair Value  Impairment  Fair Value  Impairment
             
Construction in progress- Arctic Star plant  $5,736   $10,290   $8,833   $—   
Weathered lagoon plant  $79   $6,151   $6,236   $—   
Oil and gas property -proved  $1,633   $1,375   $3,369   $—   
Oil and gas property -unproved  $77   $314   $391   $—