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Debt (Senior Notes, Term Loans, and Revolver) (Details)	1 Months Ended			3 Months Ended				9 Months Ended
Debt (Senior Notes, Term Loans, and Revolver) (Details)	Sep. 30, 2021 USD ($) asset	Jul. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) asset $ / shares	Jun. 30, 2021 $ / shares	Sep. 30, 2020 USD ($)	Jun. 30, 2020 $ / shares	Sep. 30, 2021 USD ($) asset	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt
Debt, net	$ 2,381,274,000			$ 2,381,274,000				$ 2,381,274,000		$ 2,587,731,000
Unsecured Debt, Gross	1,018,662,000			1,018,662,000				1,018,662,000		1,575,000,000
Unamortized debt issuance costs on term loans	(4,003,000)			(4,003,000)				(4,003,000)		(6,696,000)
Debt Instrument, Covenant, Minimum Liquidity Level	$ 125,000,000.0			$ 125,000,000.0				$ 125,000,000.0
Dividends \| $ / shares				$ 0.01	$ 0.01		$ 0.33
Leverage ratio	0.0700			0.0700				0.0700
Amortization of deferred financing costs				$ 1,527,000		$ 1,147,000		$ 4,211,000	$ 3,214,000
Minimum Liquidity, Cash Holdings Amount	$ 150,000,000			$ 150,000,000				$ 150,000,000
Secured Debt [Member]
Debt
Number of Assets Encumbered \| asset	19			19				19
Six Point Zero Zero Percent Due June 2025 [Member] \| Unsecured Debt [Member]
Debt
Debt Instrument, Interest Rate, Stated Percentage	6.00%			6.00%				6.00%
Senior Unsecured Notes [Member] \| Unsecured Debt [Member]
Debt
Debt Instrument, Fair Value Adjustment, Net	$ 17,700,000			$ 17,700,000				$ 17,700,000		20,900,000
Redemption premium	9,500,000
The Revolver \| Line of Credit
Debt
Maximum borrowing capacity	600,000,000			600,000,000				$ 600,000,000
Additional maturity term								1 year
Unsecured Debt	$ 200,000,000			$ 200,000,000				$ 200,000,000		400,000,000
Interest Rate	3.53%			3.53%				3.53%
Remaining borrowing capacity	$ 400,000,000			$ 400,000,000				$ 400,000,000		200,000,000
$400 Million Term Loan Maturing 2023 \| Unsecured Debt [Member]
Debt
Maximum borrowing capacity	400,000,000			400,000,000				400,000,000
Unsecured Debt	$ 203,944,000			$ 203,944,000				$ 203,944,000		400,000,000
Interest Rate	4.73%			4.73%				4.73%
Extension Option	$ 151,700,000
Extension period	1 year
$225 Million Term Loan Maturing 2023 \| Unsecured Debt [Member]
Debt
Maximum borrowing capacity	$ 225,000,000			$ 225,000,000				$ 225,000,000
Unsecured Debt	$ 114,718,000			$ 114,718,000				$ 114,718,000		225,000,000
Interest Rate	4.72%			4.72%				4.72%
Extension Option	$ 73,000,000
Extension period	1 year
$150 Million Term Loan Maturing 2023 \| Unsecured Debt [Member]
Debt
Maximum borrowing capacity	$ 150,000,000			$ 150,000,000				$ 150,000,000
Unsecured Debt	$ 100,000,000			$ 100,000,000				$ 100,000,000		150,000,000
Interest Rate	4.18%			4.18%				4.18%
Repayments of Debt								$ 20,800,000
$150 Million Term Loan Maturing 2023 \| Senior Notes [Member]
Debt
Senior Notes	$ 100,000,000			$ 100,000,000				$ 100,000,000
Debt Instrument, Extension Term			1 year
$150 Million Term Loan Maturing 2023 \| Senior Notes [Member] \| LIBOR
Debt
Basis spread on variable rate (percent)			3.00%
$150 Million Term Loan Maturing 2023 \| Senior Notes [Member] \| Base Rate
Debt
Debt Instrument, Interest Rate, Stated Percentage	2.00%			2.00%				2.00%
$400 Million Term Loan Maturing 2025 [Member] \| Unsecured Debt [Member]
Debt
Maximum borrowing capacity	$ 400,000,000			$ 400,000,000				$ 400,000,000
Unsecured Debt	$ 400,000,000			$ 400,000,000				$ 400,000,000		400,000,000
Interest Rate	4.45%			4.45%				4.45%
Conventional Mortgage Loan
Debt
Unsecured Debt	$ 814,659,000			$ 814,659,000				$ 814,659,000		1,168,304,000
$500 Million Term Loan Maturing 2026 \| Senior Notes [Member]
Debt
Debt Instrument, Interest Rate, Stated Percentage	3.75%			3.75%				3.75%
Long-term Debt, Gross										0
Senior Notes	$ 500,000,000			$ 500,000,000				$ 500,000,000
Amortization of deferred financing costs								8,000,000
$500 Million Term Loan Maturing 2026 \| Senior Notes [Member] \| Debt Instrument, Redemption, Period One
Debt
Repayments of Debt								$ 196,100,000
Debt Instrument, Redemption Price, Percentage								100.00%
$500 Million Term Loan Maturing 2026 \| Senior Notes [Member] \| Debt Instrument, Redemption, Period Two
Debt
Repayments of Debt								$ 110,300,000
Debt Instrument, Redemption Price, Percentage								101.875%
$500 Million Term Loan Maturing 2026 \| Senior Notes [Member] \| Debt Instrument, Redemption, Period Three
Debt
Repayments of Debt								$ 29,200,000
Debt Instrument, Redemption Price, Percentage								100.938%
$500 Million Term Loan Maturing 2026 \| Senior Notes [Member] \| Debt Instrument, Redemption, Period Four
Debt
Debt Instrument, Redemption Price, Percentage								100.00%
$475 Million Term Loan Maturing 2025 \| Senior Notes [Member]
Debt
Senior Notes	$ 475,000,000			$ 475,000,000				$ 475,000,000
$500 Million Senior Notes Due 2026 \| Debt Instrument, Redemption, Period One
Debt
Debt Instrument, Termination Costs		$ 1,300,000
$500 Million Senior Notes Due 2026 \| Debt Instrument, Redemption, Period Two
Debt
Debt Instrument, Termination Costs			$ 5,700,000
$500 Million Term Loan Maturing 2029 \| Senior Notes [Member]
Debt
Debt Instrument, Interest Rate, Stated Percentage	4.00%			4.00%				4.00%
Long-term Debt, Gross	$ 494,421,000			$ 494,421,000				$ 494,421,000		0
Senior Notes	500,000,000			500,000,000				500,000,000
Amortization of deferred financing costs								$ 5,600,000
$500 Million Term Loan Maturing 2029 \| Senior Notes [Member] \| Debt Instrument, Redemption, Period One
Debt
Debt Instrument, Redemption Price, Percentage								100.00%
$500 Million Term Loan Maturing 2029 \| Senior Notes [Member] \| Debt Instrument, Redemption, Period Two
Debt
Debt Instrument, Redemption Price, Percentage								102.00%
$500 Million Term Loan Maturing 2029 \| Senior Notes [Member] \| Debt Instrument, Redemption, Period Three
Debt
Debt Instrument, Redemption Price, Percentage								101.00%
$500 Million Term Loan Maturing 2029 \| Senior Notes [Member] \| Debt Instrument, Redemption, Period Four
Debt
Debt Instrument, Redemption Price, Percentage								100.00%
$500 Million Term Loan Maturing 2029 \| Senior Notes [Member] \| Debt Instrument, Redemption, Period Five
Debt
Debt Instrument, Redemption Price, Percentage								104.00%
Prepaid expenses and other assets
Debt
Deferred financing costs	3,200,000			3,200,000				$ 3,200,000		4,100,000
Fair Value, Inputs, Level 2 [Member] \| $400 Million Term Loan Maturing 2025 [Member] \| Senior Notes [Member]
Debt
Long-term Debt, Gross	0			0				0		495,759,000
Fair Value, Inputs, Level 3 [Member] \| Secured Debt [Member]
Debt
Secured Debt	379,718,000			379,718,000				379,718,000		523,668,000
Fair Value, Inputs, Level 3 [Member] \| Unsecured Debt [Member]
Debt
Unsecured Debt	$ 1,014,659,000			$ 1,014,659,000				$ 1,014,659,000		$ 1,568,304,000