Debt and Debt Issuance Costs - Credit Facility (Details) - Credit Agreement - Revolving Credit Facility - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Minimum
Line of Credit Facility [Line Items]
Interest rate on undrawn amounts	0.41%	0.41%
Maximum
Line of Credit Facility [Line Items]
Interest rate on undrawn amounts	0.91%	0.91%
London Interbank Offered Rate (LIBOR) | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.65%	1.65%
London Interbank Offered Rate (LIBOR) | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	3.65%	3.65%
Base Rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.65%	0.65%
Base Rate | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.65%	2.65%
Readily available
Line of Credit Facility [Line Items]
Readily available	$ 300.0