Debt, net - Narrative (Details)	Mar. 29, 2019 USD ($) option	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items]
Amount outstanding		$ 179,342,000	$ 194,243,000
Third Amended And Restated Credit Facility | Term Loan
Line of Credit Facility [Line Items]
Face amount	$ 175,000,000.0
Amount outstanding		$ 175,000,000.0
Weighted average interest rate percentage		3.881%
Third Amended And Restated Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum | Term Loan
Line of Credit Facility [Line Items]
Variable rate percentage	1.25%
Third Amended And Restated Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum | Term Loan
Line of Credit Facility [Line Items]
Variable rate percentage	2.30%
Third Amended And Restated Credit Facility | Base Rate | Minimum | Term Loan
Line of Credit Facility [Line Items]
Variable rate percentage	0.25%
Third Amended And Restated Credit Facility | Base Rate | Maximum | Term Loan
Line of Credit Facility [Line Items]
Variable rate percentage	1.30%
Third Amended And Restated Credit Facility | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 150,000,000.0
Number of options to extend | option	1
Length of extension	12 months
Amount outstanding		$ 0	15,000,000
Remaining borrowing capacity		150,000,000.0
Third Amended And Restated Credit Facility | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum | Line of Credit
Line of Credit Facility [Line Items]
Variable rate percentage	1.25%
Third Amended And Restated Credit Facility | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum | Line of Credit
Line of Credit Facility [Line Items]
Variable rate percentage	1.90%
Third Amended And Restated Credit Facility | Revolving Credit Facility | Base Rate | Minimum | Line of Credit
Line of Credit Facility [Line Items]
Variable rate percentage	0.25%
Third Amended And Restated Credit Facility | Revolving Credit Facility | Base Rate | Maximum | Line of Credit
Line of Credit Facility [Line Items]
Variable rate percentage	0.90%
Third Amended And Restated Credit Facility | Credit Facility, Accordion Feature
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 525,000,000.0
Third Amended And Restated Credit Facility | A-1 Term Loan, net | Term Loan
Line of Credit Facility [Line Items]
Face amount	$ 50,000,000.0
Debt term	5 years
Amount outstanding		49,889,000	49,833,000
Third Amended And Restated Credit Facility | A-2 Term Loan, net | Term Loan
Line of Credit Facility [Line Items]
Face amount	$ 50,000,000.0
Debt term	7 years
Amount outstanding		49,815,000	49,775,000
Third Amended And Restated Credit Facility | A-3 Term Loan, net | Term Loan
Line of Credit Facility [Line Items]
Face amount	$ 75,000,000.0
Debt term	7 years
Amount outstanding		$ 74,502,000	$ 74,433,000
Third Amended And Restated Credit Facility | Revolving Credit Facility, Unused Borrowing Capacity Rate 1 | Line of Credit
Line of Credit Facility [Line Items]
Unused borrowing commitment fee percentage	0.25%
Percentage of borrowing capacity outstanding	33.30%
Third Amended And Restated Credit Facility | Revolving Credit Facility, Unused Borrowing Capacity Rate 2 | Line of Credit
Line of Credit Facility [Line Items]
Unused borrowing commitment fee percentage	0.35%
Percentage of borrowing capacity outstanding	33.30%