Stock-Based Compensation - Stock option activity (Details) - Stock Options $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares
Shares
Outstanding, beginning balance (in shares) | shares	1,500
Expired (in shares) | shares	(500)
Outstanding, ending balance (in shares) | shares	1,000
Exercisable (in shares) | shares	1,000
Weighted- Average Exercise Price
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 27.95
Expired (in dollars per share) | $ / shares	22.95
Outstanding, ending balance (in dollars per share) | $ / shares	30.45
Exercisable (in dollars per share) | $ / shares	$ 30.45
Weighted-Average Remaining Contractual Term (Years), Outstanding	14 days
Weighted-Average Remaining Contractual Term (Years), Exercisable	14 days
Aggregate Intrinsic Value, Outstanding | $	$ 0
Aggregate Intrinsic Value, Exercisable | $	$ 0