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Debt - Unsecured Term Loan Facilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Total Principal	$ 1,225,434
Long-term Debt, Total	1,225,188
Unsecured Debt [Member]
Total Principal	240,000	$ 240,000
Unamortized debt issuance costs	(2,151)	(2,597)
Long-term Debt, Total	237,849	237,403
Unsecured Debt [Member] | 2023 Term Loan [Member]
Total Principal	40,000	40,000
Unsecured Debt [Member] | 2024 Term Loan Facilities[Member]
Total Principal	100,000	100,000
Unsecured Debt [Member] | 2026 Term Loan [Member]
Total Principal	$ 100,000	$ 100,000

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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-SubTopic 20
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X

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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