Stock Based Compensation - Option Plan (Details) - Stock Options - Option Plan - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Stock based compensation
Compensation expense	$ 0	$ 0
Number of shares
Exercised (in shares)	6,600
Exercisable (in shares)	0

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

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