Stock Based Compensation - Stock Based Compensation Stock Option Activity (Details) - Employee Stock Option $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of options, outstanding, beginning balance (in shares) | shares	98,161
Number of options, granted (in shares) | shares	0
Number of options, exercised (in shares) | shares	(41,422)
Number of options, forfeited (in shares) | shares	0
Number of options, outstanding, ending Balance (in shares) | shares	56,739	98,161
Number of options, vested and exercisable at end of period (in shares) | shares	56,739
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average exercise price, outstanding, beginning balance (in dollars per share) | $ / shares	$ 23.39
Weighted-average exercise price, granted (in dollars per share) | $ / shares	0
Weighted-average exercise price, exercised (in dollars per share) | $ / shares	23.18
Weighted-average exercise price, forfeited (in dollars per share) | $ / shares	0
Weighted-average exercise price, outstanding, ending balance (in dollars per share) | $ / shares	23.54	$ 23.39
Weighted-average exercise price, vested and exercisable at end of period (in dollars per share) | $ / shares	$ 23.54
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Aggregate intrinsic value, outstanding | $	$ 2,261	$ 4,522
Aggregate intrinsic value, exercised | $	1,993
Aggregate intrinsic value, vested and exercisable at end of period | $	$ 2,261
Weighted-average remaining contractual life	1 year 6 months 14 days	1 year 10 months 9 days
Weighted-average remaining contractual life, vested and exercisable at end of period	1 year 6 months 14 days