Stock-based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Shares
Outstanding at beginning of period	2,156
Granted	0
Exercised	(763)
Forfeited	(4)
Outstanding at end of period	1,389	2,156
Exercisable at end of period	1,348
Vested and expected to vest at end of period	1,387
Weighted-Average Exercise Price
Outstanding at beginning of period	$ 29.67
Granted	0
Exercised	30.72
Forfeited	36.73
Outstanding at end of period	29.08	$ 29.67
Exercisable at end of period	28.87
Vested and expected to vest at end of period	$ 29.07
Weighted-Average Remaining Contractual Term (in years)
Outstanding at beginning of period	3 years 10 months 24 days	4 years 8 months 12 days
Exercisable at end of period	3 years 9 months 18 days
Vested and expected to vest at end of period	3 years 10 months 24 days
Outstanding at end of period	3 years 10 months 24 days	4 years 8 months 12 days
Aggregate Intrinsic Value
Outstanding at end of period	$ 31,947
Exercisable at end of period	31,287
Vested and expected to vest at end of period	$ 31,914