Stock-Based Compensation - Stock Appreciation Rights (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares
WEIGHTED AVERAGE EXERCISE PRICE
Granted (in dollars per share) | $ / shares	$ 33.73
Stock Appreciation Rights (SARs)
NUMBER OF SHARES
Beginning balance (in shares) | shares	91,000
Granted (in shares) | shares	113,851
Exercised (in shares) | shares	0
Canceled (in shares) | shares	(26,687)
Ending balance (in shares) | shares	178,164
Stock exercisable (in shares) | shares	17,250
WEIGHTED AVERAGE EXERCISE PRICE
Beginning balance (in dollars per share) | $ / shares	$ 53.83
Exercised (in dollars per share) | $ / shares	0
Canceled (in dollars per share) | $ / shares	50.15
Ending balance (in dollars per share) | $ / shares	41.49
Stock exercisable (in dollars per share) | $ / shares	$ 54.35
WEIGHTED AVERAGE REMAINING CONTRACTUAL LIFE (YEARS)
Stock outstanding, weighted average remaining contractual life	4 years 2 months 12 days
Stock exercisable, weighted average remaining contractual life	3 years 6 months
AGGREGATE INTRINSIC VALUE
Stock outstanding | $	$ 0
Stock exercisable | $	$ 0