Stock-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement [Abstract]
Contractual term	10 years
Total Stock Options
Options outstanding, beginning balance (in shares)	357,075
Options granted (in shares)	0
Options exercised (in shares)	(67,558)	(192,550)	(465,232)
Options cancelled and expired (in shares)	(17,293)
Options outstanding, ending balance (in shares)	272,224	357,075
Exercisable (in shares)	272,224
Weighted- Average Exercise Price
Options outstanding, beginning balance, weighted average exercise price (in dollars per share)	$ 17.50
Options granted, weighted average exercise price (in dollars per share)	0.00
Options exercised, weighted average exercise price (in dollars per share)	17.37
Options cancelled and expired, weighted average exercise price (in dollars per share)	18.66
Options outstanding, ending balance, weighted average exercise price (in dollars per share)	17.44	$ 17.50
Exercisable, weighted average exercise price (in dollars per share)	$ 17.44
Stock Option Activity, Additional Disclosures
Options outstanding, weighted average remaining contractual term (in years)	3 years 8 months 9 days
Exercisable, weighted average remaining contractual term (in years)	3 years 8 months 9 days
Options outstanding, aggregate intrinsic value	$ 1,096,000
Exercisable, aggregate intrinsic value	$ 1,096,000
Options exercised (in shares)	67,558	192,550	465,232
Aggregate intrinsic value	$ 600	$ 2,400	$ 5,100