Shareholders' Equity (Share-Based Activity) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Equity [Abstract]
Share-based compensation expense	$ 3,727	$ 2,424	$ 11,319	$ 7,388
Fair value of shares vested	0	123	13,220	10,481
Cash received from option exercises	276	504	2,356	2,150
Tax benefit from exercises of share-based awards	$ 246	$ 198	$ 3,779	$ 2,288