Quarterly report pursuant to Section 13 or 15(d)

Debt (Credit Agreement) (Details)

v3.19.2
Debt (Credit Agreement) (Details) - Second Amended and Restated Credit Agreement - USD ($)
6 Months Ended
Jun. 30, 2019
Jul. 31, 2017
Debt Instrument [Line Items]    
Credit facility amount   $ 350,000,000
Right to increase credit facility, amount   $ 50,000,000
London Interbank Offered Rate (LIBOR) | Minimum    
Debt Instrument [Line Items]    
Spread on variable rate basis (as a percent) 1.50%  
London Interbank Offered Rate (LIBOR) | Maximum    
Debt Instrument [Line Items]    
Spread on variable rate basis (as a percent) 3.25%