Debt - Schedule of Unsecured Credit Facilities (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Outstanding Balance		$ 1,372,421	$ 1,488,570
Revolving credit facility outstanding balance			105,800
Unamortized debt issuance costs		(6,870)
Term loans and senior notes, net		864,705	864,225
Credit facilities, net		$ 1,366,621	$ 1,482,571
Weighted-average interest rate		3.47%	3.86%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest Rate, Description	[1],[2]	LIBOR + 1.40% - 2.25%
Maturity Date	[1],[3]	Jul. 27, 2022
Revolving credit facility outstanding balance	[1]		$ 105,800
Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	[1],[2]	1.40%
Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	[1],[2]	2.25%
$200 Million Term Loan [Member]
Debt Instrument [Line Items]
Interest Rate, Description	[2]	LIBOR + 1.35% - 2.20%
Maturity Date		Jul. 27, 2023
Outstanding Balance		$ 200,000	200,000
$200 Million Term Loan [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	[2]	1.35%
$200 Million Term Loan [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	[2]	2.20%
$225 Million Term Loan [Member]
Debt Instrument [Line Items]
Interest Rate, Description	[2]	LIBOR + 1.35% - 2.20%
Maturity Date		Jan. 31, 2024
Outstanding Balance		$ 225,000	225,000
$225 Million Term Loan [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	[2]	1.35%
$225 Million Term Loan [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	[2]	2.20%
$50 Million Term Loan [Member]
Debt Instrument [Line Items]
Interest Rate, Description	[2]	LIBOR + 1.35% - 2.20%
Maturity Date		Aug. 02, 2023
Outstanding Balance		$ 50,000	50,000
$50 Million Term Loan [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	[2]	1.35%
$50 Million Term Loan [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	[2]	2.20%
$175 Million term Loan [Member]
Debt Instrument [Line Items]
Interest Rate, Description	[2]	LIBOR + 1.65% - 2.50%
Maturity Date		Aug. 02, 2025
Outstanding Balance		$ 175,000	175,000
$175 Million term Loan [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	[2]	1.65%
$175 Million term Loan [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	[2]	2.50%
2017 $85 Million Term Loan [Member]
Debt Instrument [Line Items]
Interest Rate, Description	[2]	LIBOR + 1.30% - 2.10%
Maturity Date		Jul. 25, 2024
Outstanding Balance		$ 85,000	85,000
2017 $85 Million Term Loan [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	[2]	1.30%
2017 $85 Million Term Loan [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	[2]	2.10%
2019 $85 Million Unsecured Term Loan Facility [Member]
Debt Instrument [Line Items]
Interest Rate, Description	[2]	LIBOR + 1.70% - 2.55%
Maturity Date		Dec. 31, 2029
Outstanding Balance		$ 85,000	85,000
2019 $85 Million Unsecured Term Loan Facility [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	[2]	1.70%
2019 $85 Million Unsecured Term Loan Facility [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate	[2]	2.55%
$50 Million Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rate, Description	[2]	3.60% - 4.35%
Maturity Date		Mar. 31, 2030
Outstanding Balance		$ 50,000	50,000
$50 Million Senior Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest Rate		3.60%
$50 Million Senior Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest Rate		4.35%
Term Loans and Senior Loans, Net [Member]
Debt Instrument [Line Items]
Outstanding Balance		$ 870,000	870,000
Unamortized debt issuance costs		(5,295)	(5,775)
Term loans and senior notes, net		864,705	864,225
Credit Facilities, Net [Member]
Debt Instrument [Line Items]
Credit facilities, net	[1]	$ 864,705	$ 970,025
Weighted-average interest rate	[4]	3.07%	3.64%

[1] Excludes unamortized debt issuance costs related to the revolving credit facility totaling approximately $1.4 million and $2.1 million as of September 30, 2021 and December 31, 2020, respectively, which are included in other assets, net in the Company's consolidated balance sheets

[2] Interest rates on all of the unsecured credit facilities increased to 0.15% above the highest rate shown for each loan during the Extended Covenant Waiver Period from March 1, 2021 through July 28, 2021.

[3] Subject to certain conditions including covenant compliance and additional fees, the $425 million revolving credit facility maturity date may be extended up to one year, to July 27, 2023, if certain criteria are met at the time of extension.

[4] Interest rate represents the weighted-average effective annual interest rate at the balance sheet date which includes the effect of interest rate swaps in effect on $770.0 million and $745.0 million of the outstanding variable-rate debt as of September 30, 2021 and December 31, 2020, respectively. See Note 5 for more information on the interest rate swap agreements. The one-month LIBOR at September 30, 2021 and December 31, 2020 was 0.08% and 0.14%, respectively.