Stock-Based Compensation Plans Compensation Expense and Related Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 5,209	$ 6,556	$ 5,938
Tax benefits as a percentage of compensation expense	76.70%	40.90%	33.90%
Statutory tax rate	35.00%	35.00%	35.00%
Restricted Stock/RSUs/PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 4,922	$ 6,165	$ 4,646
Tax benefit	(1,559)	(2,158)	(1,626)
Stock-based compensation, net of tax	3,363	4,007	3,020
Stock Options And Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	5,209	6,556	5,938
Tax benefit	(3,994)	(2,679)	(2,011)
Stock-based compensation, net of tax	$ 1,215	$ 3,877	$ 3,927

Employee Service Share-based Compensation, Tax Benefit from Compensation Expense, Percent

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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.

+ References

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-Publisher FASB
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The amount of expense, net of income tax, 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.

+ References

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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