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Debt - Additional Information (Details)
9 Months Ended
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]  
Debt instrument, interest rate 4.99%
London Interbank Offered Rate (LIBOR) | Maximum  
Debt Instrument [Line Items]  
Basis spread on variable rate 2.75%
London Interbank Offered Rate (LIBOR) | Minimum  
Debt Instrument [Line Items]  
Basis spread on variable rate 0.75%
Revolving loan facility  
Debt Instrument [Line Items]  
Revolving loan facility commitment fee on average daily amount of unused portion 0.50%
Amounts drawn on line of credit $ 0