Stockholders' Equity - Summary of Compensation Costs (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock Awards
Class of Stock [Line Items]
Compensation expense	$ 3,939	$ 3,490	$ 3,483
Restricted Stock Units
Class of Stock [Line Items]
Compensation expense	1,510	1,269	835
Stock Option Awards
Class of Stock [Line Items]
Compensation expense	$ 1,660	$ 1,454	$ 1,878

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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