Shareholders' Equity (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Stockholders Equity Note [Line Items]
Common stock and additional paid-in capital, beginning of period	$ 1,374
Income tax benefit of common stock options exercised	1,477
Common stock issued pursuant to stock-based compensation plans, net	1,585
Stock-based compensation expense	21,147
Stock Repurchased During Period, Value	66,057
Common stock and additional paid-in capital, end of period	1,361
Common Stock [Member]
Stockholders Equity Note [Line Items]
Stock Repurchased During Period, Value	$ 24,222