Shareholders' Equity (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Stockholders' Equity Note [Abstract]
Common stock and additional paid-in capital, beginning of period	$ 1,396
Income tax benefit of common stock options exercised	3,490
Common stock issued pursuant to stock-based compensation plans, net	11,991
Stock-based compensation arrangements	12,886
Repurchase of common stock	(28,361)
Common stock and additional paid-in capital, end of period	$ 1,402