Share-Based Compensation - Summarized Information About Stock Awards (Details) - $10.39 to $34.14 $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Stock Options
Exercise price range - lower limit (in dollars per share) | $ / shares	$ 10.39
Exercise price range - upper limit (in dollars per share) | $ / shares	$ 34.14
Outstanding:
Weighted average remaining contractual life (years)	6 years 8 months 12 days
Aggregate intrinsic value	$ 45,605
Exercisable:
Number of shares (in shares) | shares	1,230
Weighted average remaining contractual life (years)	4 years 10 months 24 days
Aggregate intrinsic value	$ 28,105
Exercised:
Aggregate intrinsic value of stock options exercised	$ 3,874