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Accounting Policies Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Beginning balance $ 3,319 [1] $ 3,087  
Liabilities settled (64) 0  
Accretion expense 251 [2] 232 [3] $ 224 [3]
Ending balance $ 3,506 $ 3,319 [1] $ 3,087
[1] Adjusted to include the historical balances of the Logistics Assets Predecessor. See Notes 1 and 3 for further discussion.
[2] Includes the historical cash flows of the Logistics Assets Predecessor. See Notes 1 and 3 for further discussion.
[3] Adjusted to include the historical cash flows of the Logistics Assets Predecessor. See Notes 1 and 3 for further discussion.