Debt - Senior Unsecured Credit Facility (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items]
Senior unsecured credit facility	$ 400,000	$ 75,000
Percent of unused portion line of credit facility triggering lower commitment fee (as a percent)	50.00%
Unsecured credit facility
Line of Credit Facility [Line Items]
Interest and unused credit facility fees	$ 700
Minimum
Line of Credit Facility [Line Items]
Line of credit facility, unused capacity, commitment fee (as a percent)	0.20%
Maximum
Line of Credit Facility [Line Items]
Line of credit facility, unused capacity, commitment fee (as a percent)	0.30%
Line Of Credit Facility Covenant
Line of Credit Facility [Line Items]
Maximum leverage ratio (as a percent)	0.60
Minimum fixed charge coverage ratio	1.50
Secured recourse indebtedness	45.00%
Unencumbered leverage ratio	60.00%
Unencumbered implied debt service coverage ratio	1.2
Line Of Credit Facility Covenant Actual Results
Line of Credit Facility [Line Items]
Maximum leverage ratio (as a percent)	0.345
Minimum fixed charge coverage ratio	2.92
Secured recourse indebtedness	20.90%
Unencumbered leverage ratio	50.30%
Unencumbered implied debt service coverage ratio	1.49
LIBOR | Unsecured credit facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.45%
Less than 30% | Maximum | Unsecured credit facility
Line of Credit Facility [Line Items]
Ratio of net indebtedness to EBITDA	0.30
Less than 30% | LIBOR | Unsecured credit facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.40%
Greater than or equal to 30% but less than 35% | Minimum | Unsecured credit facility
Line of Credit Facility [Line Items]
Ratio of net indebtedness to EBITDA	0.30
Greater than or equal to 30% but less than 35% | Maximum | Unsecured credit facility
Line of Credit Facility [Line Items]
Ratio of net indebtedness to EBITDA	0.35
Greater than or equal to 30% but less than 35% | LIBOR | Unsecured credit facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.45%
Greater than or equal to 35% but less than 40% | Minimum | Unsecured credit facility
Line of Credit Facility [Line Items]
Ratio of net indebtedness to EBITDA	0.35
Greater than or equal to 35% but less than 40% | Maximum | Unsecured credit facility
Line of Credit Facility [Line Items]
Ratio of net indebtedness to EBITDA	0.40
Greater than or equal to 35% but less than 40% | LIBOR | Unsecured credit facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.50%
Greater than or equal to 40% but less than 45% | Minimum | Unsecured credit facility
Line of Credit Facility [Line Items]
Ratio of net indebtedness to EBITDA	0.40
Greater than or equal to 40% but less than 45% | Maximum | Unsecured credit facility
Line of Credit Facility [Line Items]
Ratio of net indebtedness to EBITDA	0.45
Greater than or equal to 40% but less than 45% | LIBOR | Unsecured credit facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.55%
Greater than or equal to 45% but less than 50% | Minimum | Unsecured credit facility
Line of Credit Facility [Line Items]
Ratio of net indebtedness to EBITDA	0.45
Greater than or equal to 45% but less than 50% | Maximum | Unsecured credit facility
Line of Credit Facility [Line Items]
Ratio of net indebtedness to EBITDA	0.50
Greater than or equal to 45% but less than 50% | LIBOR | Unsecured credit facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.70%
Greater than or equal to 50% but less than 55% | Minimum | Unsecured credit facility
Line of Credit Facility [Line Items]
Ratio of net indebtedness to EBITDA	0.50
Greater than or equal to 50% but less than 55% | Maximum | Unsecured credit facility
Line of Credit Facility [Line Items]
Ratio of net indebtedness to EBITDA	0.55
Greater than or equal to 50% but less than 55% | LIBOR | Unsecured credit facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.90%
Greater than or equal to 55% | Minimum | Unsecured credit facility
Line of Credit Facility [Line Items]
Ratio of net indebtedness to EBITDA	0.55
Greater than or equal to 55% | LIBOR | Unsecured credit facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.05%
Revolving Credit Facility | Unsecured credit facility
Line of Credit Facility [Line Items]
Senior unsecured credit facility	$ 400,000	$ 75,000
Revolving Credit Facility | LIBOR | Unsecured credit facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.40%