Stock-Based Compensation - Schedule of Summary of Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Shares
Outstanding (in shares) | shares	339
Exercised (in shares) | shares	(219)
Outstanding (in shares) | shares	120
Exercisable (in shares) | shares	120
Vested or expected to vest (in shares) | shares	120
Weighted Average Exercise Price
Outstanding (in dollars per share) | $ / shares	$ 36.36
Exercised (in dollars per share) | $ / shares	35.83
Outstanding (in dollars per share) | $ / shares	37.33
Exercisable (in dollars per share) | $ / shares	37.33
Vested or expected to vest (in dollars per share) | $ / shares	$ 37.33
Weighted Average Remaining Contractual Term & Aggregate Intrinsic Value
Outstanding	1 year 9 months 11 days
Exercisable	1 year 9 months 11 days
Vested or expected to vest	1 year 9 months 11 days
Outstanding | $	$ 2,852
Exercisable | $	2,852
Vested or expected to vest | $	$ 2,852