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Stock Compensation Plans - Time-Based Restricted Stock Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Compensation expense
Total Compensation		$ 6,002	$ 5,323	$ 6,091
Restricted Stock, subject to time-based criteria
Compensation expense
Total Compensation		700	500	2,000
Unamortized future compensation expense		500
Tax benefit related to compensation expense		$ 200	$ 200	$ 500
Summary of restricted stock activity
Nonvested, January 1, 2020	121	121
Shares vested		(65)
Nonvested, December 31, 2020		56	121
Weighted average remaining term (years)
Outstanding (years)		10 months 20 days	1 year 8 months 15 days
Weighted average grant date fair value
Nonvested, January 1, 2020	$ 14.88	$ 14.88
Shares vested (per share)		14.47
Nonvested, December 31, 2020		$ 14.60	$ 14.88
Restricted Stock, subject to time-based criteria | Tranche One
Plan information
Vesting period (in years)		1 year
Compensation expense
Vesting rights percentage		25.00%
Restricted Stock, subject to time-based criteria | Share-based Payment Employee
Plan information
Vesting period (in years)		4 years
Restricted Stock, subject to time-based criteria | Share-based Payment Employee | Executive officers
Plan information
Vesting period (in years)		4 years
Time-Based Restricted Stock Units settled in stock
Compensation expense
Total Compensation		$ 2,500	$ 1,000
Unamortized future compensation expense		5,100
Tax benefit related to compensation expense		$ 500	$ 300
Summary of restricted stock activity
Shares vested		(121)
Shares awarded		331
Shares forfeited		(21)
Nonvested, December 31, 2020	190	379
Weighted average remaining term (years)
Outstanding (years)	2 years 6 months 14 days	2 years 6 months 18 days
Weighted average grant date fair value
Shares vested (per share)		$ 14.91
Shares awarded (per share)		17.81
Shares forfeited (per share)		15.07
Nonvested, December 31, 2020	$ 13.78	$ 16.87
Time-Based Restricted Stock Units settled in stock | Tranche One
Plan information
Vesting period (in years)		1 year
Compensation expense
Vesting rights percentage		25.00%
Time-Based Restricted Stock Units settled in stock | Share-based Payment Employee
Plan information
Vesting period (in years)		4 years
Time-Based Restricted Stock Units settled in stock | Share-based Payment Employee | Executive officers
Plan information
Vesting period (in years)		4 years

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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