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Accumulated Other Comprehensive Loss - Amounts Reclassified from Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Interest rate contract | Loss on Cash Flow Hedge | Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Interest expense $ 216 $ 431