XML 57 R42.htm IDEA: XBRL DOCUMENT v3.19.1
Long-term Debt - Summary of Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Revolving Credit Facility    
Debt Instrument [Line Items]    
Revolving credit agreement $ 92,450 $ 85,300