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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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Notes Payable (Debt Associated with the Merger) (Details) - USD ($)	Mar. 25, 2019	Dec. 31, 2019	Dec. 31, 2018
Line of Credit Facility [Line Items]
Long-term debt		$ 2,218,093,000	$ 1,067,362,000
Term Loan
Line of Credit Facility [Line Items]
Long-term debt		$ 250,000,000	$ 250,000,000
Interest rate		2.96%
Unsecured Variable Rate Debt of TIER \| Term Loan \| TIER
Line of Credit Facility [Line Items]
Repayment of debt	$ 679,000,000
Debt amount	$ 679,000,000.0