Stockholders' Equity - Compensation Costs Recognized (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restricted Stock Awards
Class of Stock [Line Items]
Compensation cost	$ 1,011	$ 789	$ 2,962	$ 2,589
Restricted Stock Units
Class of Stock [Line Items]
Compensation cost	327	279	971	841
Stock Option Awards
Class of Stock [Line Items]
Compensation cost	$ 439	$ 380	$ 1,253	$ 1,103

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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