Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stockholders' Equity Note [Abstract]
Stock-based compensation expense	$ 3,867	$ 3,786	$ 11,476	$ 9,481
Less: Deferred tax benefit	(1,425)	(1,322)	(4,084)	(3,272)
Stock-based compensation expense, net of tax	$ 2,442	$ 2,464	$ 7,392	$ 6,209