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Stock-Based Compensation - Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Number of Options (in 000's)  
Outstanding at beginning of period (in shares) | shares 652
Granted (in shares) | shares 92
Exercised (in shares) | shares (8)
Forfeited/canceled/expired (in shares) | shares 0
Outstanding at end of period (in shares) | shares 736 [1]
Vested and expected to vest at end of period (in shares) | shares 736 [1]
Exercisable at end of period (in shares) | shares 452 [1]
Weighted-Average Exercise Price  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 39.27
Granted (in dollars per share) | $ / shares 62.70
Exercised (in dollars per share) | $ / shares 29.53
Forfeited/canceled/expired (in dollars per share) | $ / shares 0.00
Outstanding at end of period (in dollars per share) | $ / shares 42.30 [1]
Vested and expected to vest at end of period (in dollars per share) | $ / shares 42.30 [1]
Exercisable at end of period (in dollars per share) | $ / shares $ 34.30 [1]
Weighted-Average Remaining Contractual Term (in years)  
Outstanding at end of period 4 years 10 months 9 days [1]
Vested and expected to vest at end of period 4 years 10 months 9 days [1]
Exercisable at end of period 4 years 1 month 6 days [1]
Exercised | $ $ 306
Outstanding at end of period | $ 19,275 [1]
Vested and expected to vest at end of period | $ 19,272 [1]
Exercisable at end of period | $ $ 15,450 [1]
[1] The aggregate intrinsic value represents the total pre-tax value (the difference between our closing stock price on the last trading day of the first quarter of 2017 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 March 31, 2017. This amount will change based on the fair market value of our stock.