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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Options      
Outstanding at beginning of the year (in shares) 520 652 648
Granted (in shares) 119 92 243
Exercised (in shares) (35) (56) (239)
Forfeited/canceled/expired (in shares) (7) (168) 0
Outstanding at end of the year (in shares) 597 520 652
Vested and expected to vest at the end of the year (in shares) 597 520 652
Exercisable at the end of the year (in shares) 430 381 363
Weighted-Average Exercise Price      
Outstanding at beginning of the year (in dollars per share) $ 42.56 $ 39.27 $ 30.50
Granted (in dollars per share) 44.95 62.70 49.67
Exercised (in dollars per share) 24.67 25.72 26.09
Forfeited/canceled/expired (in dollars per share) 27.74 46.44 0.00
Outstanding at end of the year (in dollars per share) 44.27 42.56 39.27
Vested and expected to vest at the end of the year (in dollars per share) 44.27 42.56 39.27
Exercisable at the end of the year (in dollars per share) $ 42.30 $ 36.39 $ 30.21
Weighted-Average Remaining Contractual Term and Aggregate Intrinsic Value      
Outstanding at end of the year 4 years 29 days 4 years 3 months 4 years 9 months 11 days
Vested and expected to vest at the end of the year 4 years 29 days 4 years 3 months 4 years 9 months 11 days
Exercisable at the end of the year 3 years 5 months 5 days 3 years 8 months 19 days 3 years 10 months 17 days
Exercised $ 744 $ 2,140 $ 9,933
Outstanding at end of the year 758 5,607 16,553
Vested and expected to vest at the end of the year 758 5,607 16,548
Exercisable at the end of the year $ 758 $ 5,607 $ 12,511