Stock-Based Compensation - Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($) $ / shares shares
NUMBER OF SHARES
Beginning balance (in shares) | shares	212,044
Granted (in shares) | shares	12,000
Canceled (in shares) | shares	(26,013)
Ending balance (in shares) | shares	198,031
Stock exercisable (in shares) | shares	71,028
WEIGHTED  AVERAGE EXERCISE PRICE
Beginning balance (in dollars per share) | $ / shares	$ 32.28
Granted (in dollars per share) | $ / shares	18.00
Canceled (in dollars per share) | $ / shares	30.50
Ending balance (in dollars per share) | $ / shares	31.64
Stock exercisable (in dollars per share) | $ / shares	$ 44.67
WEIGHTED AVERAGE REMAINING CONTRACTUAL LIFE (YEARS)
Stock outstanding (in years)	3 years 1 month 6 days
Stock exercisable (in years)	2 years 3 months 18 days
AGGREGATE INTRINSIC VALUE
Stock outstanding | $	$ 161
Stock exercisable | $	$ 4