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Stock Compensation Plans - Performance-Based Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards, fair value	$ 4,740	$ 3,368	$ 3,973
Compensation expense
Total Compensation	6,002	5,323	6,091
Restricted Stock, subject to performance criteria
Compensation expense
Total Compensation	1,100	1,800	2,000
Unamortized future compensation expense	800
Tax benefit related to compensation expense	$ 200	$ 200	$ 500
Summary of restricted stock activity
Nonvested, January 1, 2020	492,000
Shares vested	(102,000)
Shares awarded	78,000
Shares forfeited	(9,000)
Nonvested, December 31, 2020	459,000	492,000
Weighted average remaining term (years)
Outstanding (years)	9 months 29 days	1 year 3 months
Weighted average grant date fair value
Nonvested, January 1, 2020	$ 14.46
Shares vested (per share)	14.46
Shares awarded (per share)	19.72
Shares forfeited (per share)	18.32
Nonvested, December 31, 2020	$ 15.29	$ 14.46
Restricted Stock, subject to performance criteria | Three-year performance targets
Plan information
Performance period	3 years
Performance-based restricted stock, earned
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation awards issued shares	0
Performance-based restricted stock, earned | Three-year performance targets
Plan information
Performance period	3 years
Vesting period (in years)	3 years
Market-Based Restricted Stock Units settled in stock
Compensation expense
Total Compensation	$ 400
Unamortized future compensation expense	1,100
Tax benefit related to compensation expense	$ 100
Summary of restricted stock activity
Shares awarded	52,000
Nonvested, December 31, 2020	52,000
Weighted average remaining term (years)
Outstanding (years)	2 years
Weighted average grant date fair value
Shares awarded (per share)	$ 28.44
Nonvested, December 31, 2020	$ 28.44
Market-Based Restricted Stock Units settled in stock | Three-year performance targets
Plan information
Performance period	3 years
Vesting period (in years)	3 years
2009 Equity Incentive Plan | Restricted Stock, subject to performance criteria
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation awards issued shares	52,000,000	81	3
Restricted stock awards, fair value	$ 1,500

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