Stock-Based Compensation - Summary of the Company's PRSU Activity (Details) - PRSUs - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Number of PRSUs
Outstanding at the beginning of the period	400,000	400,000	400,000
Granted	100,000	200,000	200,000
Additional performance shares			100,000
Issued	(200,000)	(200,000)	(300,000)
Outstanding at the end of the period	336,305	400,000	400,000
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period	$ 45.35	$ 42.66	$ 36.59
Granted	68.15	50.50	43.96
Additional performance shares			28.09
Issued	43.96	42.57	28.15
Outstanding at the end of the period	$ 51.75	$ 45.35	$ 42.66