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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following table sets forth a summary of the changes in fair value of these interest rate swaps (in thousands):
 
Six Months Ended June 30,
 
2018
 
2017
Beginning balance
$
(1,795
)
 
$
(3,175
)
Unrealized losses included in interest expense
—

 
(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
)
Ending balance
$
(1,161
)
 
$
(2,798
)