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Assets Held For Sale - Assets Held for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loss on impairment of property $ 0 $ 0 $ 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 553   553   $ 58
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]          
Net book value of assets for sale 0 0 58 4,669  
Net gain on sale of assets $ 0 $ 0 $ 1,627 $ 4,195