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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
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Compensation expense
Total Compensation	$ 6,091	$ 5,372	$ 4,871
Restricted Stock, subject to time-based criteria
Compensation expense
Total Compensation	2,000	2,100	2,200
Unamortized future compensation expense	2,600
Tax benefit related to compensation expense	$ 500	$ 600	$ 700
Summary of restricted stock activity
Outstanding shares	269
Shares vested	(162)
Shares awarded	183
Shares forfeited	(49)
Outstanding shares	241	269
Weighted average remaining term (years)
Outstanding (years)	2 years 2 months 1 day	1 year 6 months 29 days
Weighted average grant date fair value
Outstanding, beginning balance (per share)	$ 16.99
Shares vested (per share)	16.82
Shares awarded (per share)	14.79
Shares forfeited (per share)	18.72
Outstanding, Ending balance (per share)	$ 15.08	$ 16.99
Restricted Stock, subject to time-based criteria | Executive Officer
Plan information
Vesting period (in years)		4 years

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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