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Debt - $200 Million Term Loan A (Details) - Secured Debt [Member] - $200 Million Term Loan A [Member] - USD ($)
1 Months Ended 12 Months Ended
May 31, 2017
Dec. 31, 2018
Debt Instrument [Line Items]    
Face amount   $ 200,000,000
Debt instrument, maturity date   May 23, 2022
Net proceeds, after certain transaction expenses payable at closing $ 194,600,000  
London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Spread rate (as a percent)   1.50%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Spread rate (as a percent)   1.50%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Spread rate (as a percent)   2.35%