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Fair Value Measurements (Details) - Interest Rate Swap [Member] - Fair Value, Inputs, Level 2 [Member] - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Fair Value Assets and Liabilities Measured on Recurring Basis Fair value and input reconciliation [Roll Forward]    
Cash flow hedge fair value, beginning balance $ (3,175) $ (4,938)
Realized (unrealized) losses included in interest expense 73 (33)
Realized losses on derecognition of interest rate swaps included in earnings 273 0
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss 1,076 1,208
Unrealized losses included in equity and partners’ capital (280) (748)
Cash flow hedge fair value, ending balance $ (2,000) $ (4,511)