The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Nominal or face amount used to calculate payments on the derivative asset.

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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Nominal or face amount used to calculate payment on derivative.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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Derivative Financial Instruments - Narrative (Details)	6 Months Ended
Derivative Financial Instruments - Narrative (Details)	Jun. 30, 2020 USD ($) deritavtive	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) deritavtive	Jun. 30, 2019 USD ($)	Apr. 01, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 01, 2014 USD ($)
Derivative [Line Items]
Interest rate cap notional value			$ 100,000,000.0
Estimated amount to be reclassified in the next twelve months	$ 300,000
Stockholders' Equity Attributable to Parent	1,589,266,000	$ 1,542,722,000	$ 1,517,123,000	$ 1,436,178,000		$ 1,333,176,000	$ 1,247,797,000
Common Shares Held in Deferred Compensation Plan
Derivative [Line Items]
Stockholders' Equity Attributable to Parent	139,224,000	$ 135,494,000
Interest rate cap
Derivative [Line Items]
Interest rate cap notional value	$ 100,000,000.0
Derivative cap interest rate	4.00%
Interest rate cap \| Minimum
Derivative [Line Items]
Derivative, basis spread on variable rate	1.20%
Interest rate cap \| Maximum
Derivative [Line Items]
Derivative, basis spread on variable rate	1.70%
Interest rate cap \| Cash flow hedging
Derivative [Line Items]
Number of interest rate cap transactions \| deritavtive	1		2
Interest rate cap, Maturity 5/4/2021
Derivative [Line Items]
Notional amount	$ 50,000,000.0		$ 50,000,000					$ 50,000,000.0
Derivative cap interest rate	4.00%
Interest rate cap, Maturity 4/1/2019
Derivative [Line Items]
Notional amount	$ 0		50,000,000		$ 50,000,000.0
Derivative cap interest rate	4.00%
Interest rate cap, Maturity 2/3/2020
Derivative [Line Items]
Notional amount	$ 50,000,000		$ 100,000,000