Stock-Based Compensation Compensation Expense and Related Tax Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation expense	$ 1,767	$ 1,989	$ 2,838	$ 3,022
Tax benefit	(622)	(446)	(914)	(709)
Stock-based compensation expense, net of tax	$ 1,145	$ 1,543	$ 1,924	$ 2,313