Stock-Based Compensation - Stock option activity (Details) - Stock Options $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares
Shares
Outstanding, beginning balance (in shares) | shares	1,500
Expired (in shares) | shares	(1,500)
Outstanding, ending balance (in shares) | shares	0
Exercisable (in shares) | shares	0
Weighted- Average Exercise Price
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 27.95
Expired (in dollars per share) | $ / shares	27.95
Outstanding, ending balance (in dollars per share) | $ / shares	0
Exercisable (in dollars per share) | $ / shares	$ 0
Weighted-Average Remaining Contractual Term (Years), Outstanding	0 years
Weighted-Average Remaining Contractual Term (Years), Exercisable	0 years
Aggregate Intrinsic Value, Outstanding | $	$ 0
Aggregate Intrinsic Value, Exercisable | $	$ 0