Stock-Based Compensation - Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares
NUMBER OF SHARES
Beginning balance (in shares) | shares	163,016
Granted (in shares) | shares	23,000
Canceled (in shares) | shares	(18,122)
Ending balance (in shares) | shares	167,894
Stock exercisable (in shares) | shares	38,107
WEIGHTED AVERAGE EXERCISE PRICE
Beginning balance (in dollars per share) | $ / shares	$ 41.70
Granted (in dollars per share) | $ / shares	16.89
Canceled (in dollars per share) | $ / shares	42.87
Ending balance (in dollars per share) | $ / shares	38.17
Stock exercisable (in dollars per share) | $ / shares	$ 51.32
WEIGHTED AVERAGE REMAINING CONTRACTUAL LIFE (YEARS)
Stock outstanding, weighted average remaining contractual life	3 years 7 months 6 days
Stock exercisable, weighted average remaining contractual life	3 years
AGGREGATE INTRINSIC VALUE
Stock outstanding | $	$ 4
Stock exercisable | $	$ 0