Stock-Based Compensation - Share Appreciation Rights (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock options outstanding (in shares)	291,779	319,086	617,446	656,611
Stock options outstanding (in dollars per share)	$ 14.05	$ 13.53	$ 10.53	$ 10.76
SARS outstanding (in shares)	32,282	42,152	42,152	42,152
SARs outstanding (in dollars per share)	$ 15.40	$ 14.14	$ 14.14	$ 14.14
Stock options granted (in shares)		14,310	14,820
Stock options granted (in dollars per share)		$ 7.91	$ 7.60
SARs granted (in shares)		0	0
SARs granted (in dollars per share)		$ 0	$ 0
Stock options exercised (in shares)	(11,055)	(159,069)	(26,966)
Stock options exercised (in dollars per share)	$ 5.57	$ 3.35	$ 3.28
SARs exercised (in shares)	0	0	0
SARs exercised (in dollars per share)	$ 0	$ 0	$ 0
Stock options canceled/forfeited (in shares)	(11,519)	(153,601)	(27,019)
Stock options canceled/forfeited (in dollars per share)	$ 9.31	$ 11.48	$ 21.88
SARs canceled/forfeited (in shares)	0	0	0
SARs canceled/forfeited (in dollars per share)	$ 0	$ 0	$ 0
Stock options expired (in shares)	(4,733)
Stock options expired (in dollars per share)	$ 10.00
SARs expired (in shares)	(9,870)
SARS expired (in dollars per share)	$ 10.00