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Debt - Unsecured Term Loan Facilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Total Principal	$ 876,100
Unsecured Debt [Member]
Total Principal	240,000	$ 258,543
Unamortized debt issuance costs	(2,597)	(2,124)
Long-term Debt, Total	237,403	256,419
Unsecured Debt [Member] | 2019 Term Loan [Member]
Total Principal		18,543
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.

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- Definition

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

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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.

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