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Changes in Accumulated Other Comprehensive Loss - Components (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance at December 31, 2018 $ (7,904)
Amounts Reclassified from Accumulated Other Comprehensive Loss, net of tax 85
Balance at June 30, 2019 $ (7,819)