Shareholders' Equity Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 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	8,477
Common stock issued pursuant to stock-based compensation plans, net	25,464
Stock-based compensation expense	23,937
Repurchase of common stock	(76,624)
Common stock and additional paid-in capital, end of period	$ 24,209