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Stock-Based Compensation - Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Number of Options (in 000's)  
Outstanding at December 31, 2015 (in shares) | shares 648
Granted (in shares) | shares 244
Exercised (in shares) | shares (104)
Forfeited/canceled/expired (in shares) | shares 0
Outstanding at June 30, 2016 (in shares) | shares 788
Vested and expected to vest at June 30, 2016 (in shares) | shares 788
Exercisable on June 30, 2016 (in shares) | shares 462
Weighted-Average Exercise Price  
Outstanding at December 31, 2015 (in dollars per share) | $ / shares $ 30.50
Granted (in dollars per share) | $ / shares 49.67
Exercised (in dollars per share) | $ / shares 24.44
Forfeited/canceled/expired (in dollars per share) | $ / shares 0.00
Outstanding at June 30, 2016 (in dollars per share) | $ / shares 37.22
Vested and expected to vest at June 30, 2016 (in dollars per share) | $ / shares 37.22
Exercisable on June 30, 2016 (in dollars per share) | $ / shares $ 28.13
Weighted-Average Remaining Contractual Term (in years)  
Outstanding at June 30, 2016 5 years 1 month 17 days
Vested and expected to vest at June 30, 2016 5 years 1 month 17 days
Exercisable on June 30, 2016 4 years 4 months 2 days
Exercised | $ $ 3,619
Outstanding at June 30, 2016 | $ 27,606 [1]
Vested and expected to vest at June 30, 2016 | $ 27,597 [1]
Exercisable on June 30, 2016 | $ $ 20,376 [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 second quarter of 2016 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 June 30, 2016. This amount will change based on the fair market value of our stock.