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Stockholders' Equity - Compensation Costs Recognized (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restricted Stock Awards
Class of Stock [Line Items]
Compensation cost	$ 1,252	$ 1,036	$ 2,364	$ 1,951
Restricted Stock Units
Class of Stock [Line Items]
Compensation cost	328	324	656	644
Stock Option Awards
Class of Stock [Line Items]
Compensation cost	$ 499	$ 434	$ 945	$ 814

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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