Share-Based Compensation - Summary of Grant Date Fair Value of Awards (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options	$ 12,932	$ 3,699	$ 6,102
Restricted stock	3,609	4,217	3,147
Total	$ 16,541	$ 7,916	$ 9,249