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Fair Value Measurements (Details) - Interest Rate Swap [Member] - Fair Value, Inputs, Level 2 [Member] - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Fair Value Assets and Liabilities Measured on Recurring Basis Fair value and input reconciliation [Roll Forward]    
Cash flow hedge fair value, beginning balance $ (1,795) $ (3,175)
Unrealized losses included in interest expense 0 (23)
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss 219 755
Unrealized gains (losses) included in equity and partners’ capital 415 (355)
Cash flow hedge fair value, ending balance $ (1,161) $ (2,798)