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Assets Held For Sale - Assets Held for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loss on impairment of property $ 0 $ 0      
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Long lived assets held for sale         $ 464
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Long lived assets held for sale 0   $ 0    
Net book value of assets for sale 464 0 464 $ 58  
Net gain on sale of assets $ 197 $ 0 $ 197 $ 1,627