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Debt Obligations - Schedule of Principal Outstanding (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Long Term Debt [Line Items]
2020	$ 56,118
2021	56,415
2022 (includes $158.4 million outstanding on WEST II Series A 2012 term note)	207,994
2023	34,018
2024 (includes $397.0 million outstanding on revolving credit facility)	430,185
Thereafter	485,739
Total	1,270,469	$ 1,358,430
WEST II
Long Term Debt [Line Items]
2022 (includes $158.4 million outstanding on WEST II Series A 2012 term note)	158,400
Total	211,572	$ 237,847
Revolving credit facility
Long Term Debt [Line Items]
2024 (includes $397.0 million outstanding on revolving credit facility)	$ 397,000

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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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