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Fair Value Measurements - Summary of Fair Value and Carrying Amounts of Long Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Summary of The Fair Value And Carrying Amounts of Long Term Debt [Line Items]    
Carrying Value $ 235,989 $ 224,258
Fair Value, Inputs, Level 2 [Member]    
Summary of The Fair Value And Carrying Amounts of Long Term Debt [Line Items]    
Fair Value 236,219 240,057
Carrying Value $ 219,920 $ 220,998