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Fair Value Measurements - Summary of Fair Value and Carrying Amounts of Long Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Carrying Value $ 247,896 $ 242,315
Fair Value, Inputs, Level 2 [Member]    
Fair Value 235,592 234,163
Carrying Value $ 219,589 $ 220,709