Shareholders' Equity Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Stockholders' Equity Note [Abstract]
Common stock and additional paid-in capital, beginning of period	$ 42,955
Income tax benefit of common stock options exercised	2,865
Common stock issued pursuant to stock-based compensation plans, net	7,124
Stock-based compensation expense	8,756
Repurchase of common stock	(1,766)
Common stock and additional paid-in capital, end of period	$ 59,934