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Stock Compensation Plans - Performance-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 performance criteria
Compensation expense
Total Compensation	2,000	1,300	600
Unamortized future compensation expense	1,600
Tax benefit related to compensation expense	$ 500	$ 500	$ 100
Summary of restricted stock activity
Outstanding shares	236
Shares vested	(25)
Shares awarded	187
Shares forfeited	(68)
Outstanding shares	330	236
Weighted average remaining term (years)
Outstanding (years)	1 year 5 months 12 days	1 year 10 months 6 days
Weighted average grant date fair value
Outstanding, beginning balance (per share)	$ 15.69
Shares vested (per share)	14.79
Shares awarded (per share)	14.89
Shares forfeited (per share)	16.79
Outstanding, Ending balance (per share)	$ 15.07	$ 15.69
Restricted Stock, subject to performance criteria | Three-year performance targets
Plan information
Performance period	3 years
Performance-based restricted stock, earned
Summary of restricted stock activity
Outstanding shares	9
Performance-based restricted stock, earned | Three-year performance targets
Plan information
Performance period	3 years
Vesting period (in years)	3 years
Performance-based restricted stock, unearned
Summary of restricted stock activity
Outstanding shares	321

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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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