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Fair Value - Recurring Basis (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Financial assets:
Short-term investments	$ 0	$ 59,474,000
Financial liabilities:
Derivative instruments - interest rate swaps	117,265,000	65,078,000
Carrying Amount
Financial assets:
Short-term investments	0	59,474,000
Carrying Amount | Interest Rate Swaps
Financial liabilities:
Derivative instruments - interest rate swaps	117,265,000	65,078,000
Level 1 | Fair Value
Financial assets:
Short-term investments	0	0
Level 1 | Fair Value | Interest Rate Swaps
Financial liabilities:
Derivative instruments - interest rate swaps	0	0
Level 2 | Fair Value
Financial assets:
Short-term investments	0	59,474,000
Level 2 | Fair Value | Interest Rate Swaps
Financial liabilities:
Derivative instruments - interest rate swaps	117,265,000	65,078,000
Level 3 | Fair Value
Financial assets:
Short-term investments	0	0
Level 3 | Fair Value | Interest Rate Swaps
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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