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Fair Value - Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial assets:
Short-term investments	$ 0	$ 19,973
Financial liabilities:
Derivative instruments - interest rate swaps	80,143	92,521
Carrying Amount | Recurring
Financial assets:
Short-term investments	0	19,973
Carrying Amount | Interest Rate Swaps | Recurring
Financial liabilities:
Derivative instruments - interest rate swaps	80,143	92,521
Level 1 | Fair Value | Recurring
Financial assets:
Short-term investments	0	0
Level 1 | Fair Value | Interest Rate Swaps | Recurring
Financial liabilities:
Derivative instruments - interest rate swaps	0	0
Level 2 | Fair Value | Recurring
Financial assets:
Short-term investments	0	19,973
Level 2 | Fair Value | Interest Rate Swaps | Recurring
Financial liabilities:
Derivative instruments - interest rate swaps	80,143	92,521
Level 3 | Fair Value | Recurring
Financial assets:
Short-term investments	0	0
Level 3 | Fair Value | Interest Rate Swaps | Recurring
Financial liabilities:
Derivative instruments - interest rate swaps	$ 0	$ 0

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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