Stock-Based Compensation Plans Compensation Expense and Related Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 6,556	$ 5,938	$ 5,865
Tax benefits as a percentage of compensation expense	40.90%	33.90%	27.40%
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	$ 6,165	$ 4,646	$ 4,345
Tax benefit	(2,158)	(1,626)	(1,510)
Stock-based compensation, net of tax	4,007	3,020	2,835
Stock Options And Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	6,556	5,938	5,865
Tax benefit	(2,679)	(2,011)	(1,608)
Stock-based compensation, net of tax	$ 3,877	$ 3,927	$ 4,257

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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