Stock Compensation Plans - Performance-Based Restricted Stock Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Compensation expense
Total Compensation	$ 5,323	$ 6,091	$ 5,372
Restricted Stock, subject to performance criteria
Compensation expense
Total Compensation	1,800	2,000	1,300
Unamortized future compensation expense	3,100
Tax benefit related to compensation expense	$ 200	$ 500	$ 500
Summary of restricted stock activity
Nonvested, January 1, 2019	330
Shares vested	(9)
Shares awarded	226
Shares forfeited	(55)
Nonvested, December 31, 2019	492	330
Weighted average remaining term (years)
Outstanding (years)	1 year 3 months	1 year 5 months 12 days
Weighted average grant date fair value
Nonvested, January 1, 2019	$ 15.07
Shares vested (per share)	27.13
Shares awarded (per share)	14.12
Shares forfeited (per share)	14.65
Nonvested, December 31, 2019	$ 14.46	$ 15.07
Restricted Stock, subject to performance criteria | Three-year performance targets
Plan information
Performance period	3 years
Performance-based restricted stock, earned | Three-year performance targets
Plan information
Performance period	3 years
Vesting period (in years)	3 years