Shareholders' Equity (Share-Based Activity) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Equity [Abstract]
Share-based compensation expense	$ 2,424	$ 2,104	$ 7,388	$ 6,070
Fair value of shares vested	123	1,242	10,481	11,743
Cash received from option exercises	504	9,561	2,150	23,289
Tax benefit from option exercises	$ 198	$ 680	$ 2,288	$ 1,890