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Stock-Based Compensation - Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Options      
Outstanding at beginning of the year 650 924 1,412
Granted 77 133 201
Exercised (71) (391) (679)
Forfeited/canceled/expired (8) (16) (10)
Outstanding at end of the year 648 650 924
Vested and expected to vest at the end of the year 648 649 921
Exercisable at the end of the year 493 421 671
Weighted-Average Exercise Price      
Outstanding at beginning of the year $ 25.56 $ 22.04 $ 20.56
Granted 64.81 35.28 19.68
Exercised 23.97 20.76 18.22
Forfeited/canceled/expired 20.64 20.77 24.75
Outstanding at end of the year 30.50 25.56 22.04
Vested and expected to vest at the end of the year 30.50 25.57 22.05
Exercisable at the end of the year $ 25.03 $ 23.84 $ 22.62
Weighted-Average Remaining Contractual Term and Aggregate Intrinsic Value      
Outstanding at beginning of the year 4 years 10 months 5 days 5 years 7 months 2 days 6 years 1 month 3 days
Vested and expected to vest at the end of the year 4 years 10 months 5 days 5 years 6 months 28 days 6 years 28 days
Exercisable at the end of the year 4 years 6 months 3 days 4 years 10 months 13 days 5 years 1 month 20 days
Exercised $ 2,193 $ 10,651 $ 8,355
Outstanding at end of the year [1] 14,556 25,653 14,854
Vested and expected to vest at the end of the year [1] 14,551 25,618 14,791
Exercisable at the end of the year [1] $ 12,979 $ 17,345 $ 10,388
[1] The aggregate intrinsic value represents the total pre-tax value (the difference between our closing stock price on the last trading day of 2015, 2014, and 2013 and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had they all exercised their options on December 31, 2015, 2014, and 2013. This amount will change based on the fair market value of our stock.