Stock-Based Compensation Plans - Stock-based Compensation Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Shares Available for Grant [Roll Forward]
Balance at beginning of period (shares)	2,685,209	1,086,737	1,103,836
Additional shares reserved (shares)	1,000,000	1,851,794	1,200,000
Options granted (shares)	(45,622)	(255,000)	(568,987)
Restricted stock units granted (shares)	(593,003)	(508,729)	(1,205,200)
Options canceled (shares)	37,520	41,681	307,738
Restricted stock units canceled (shares)	174,094	157,358	163,689
Restricted stock units withheld for tax (shares)	259,107	311,368	85,661
Balance at end of period (shares)	3,517,305	2,685,209	1,086,737
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balance at beginning of period (shares)	3,242,421	3,598,385	4,128,334
Options granted (shares)	45,622	255,000	568,987
Options exercised (shares)	(608,931)	(569,283)	(791,198)
Options canceled (shares)	(37,520)	(41,681)	(307,738)
Balance at end of period (shares)	2,641,592	3,242,421	3,598,385
Vested and expected to vest, end of period (shares)	2,620,217
Exercisable, end of period, Shares	2,127,228
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Balance at beginning of period, weighted-average exercise price (per share)	$ 6.47	$ 5.36	$ 4.96
Options granted, period, weighted-average exercise price (per share)	34.65	18.42	6.60
Options exercised, period, weighted-average exercise price (per share)	6.79	4.89	3.34
Options canceled, period, weighted-average exercise price (per share)	8.55	5.50	7.36
Balance at ending of period, weighted-average exercise price (per share)	6.86	$ 6.47	$ 5.36
Vested and expected to vest, end of period, period, weighted-average exercise price (per share)	6.80
Exercisable, end of period, period, weighted-average exercise price (per share)	$ 6.22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Balance at end of period, weighted-average remaining contractual life	6 years 9 months 22 days
Balance at end of period, aggregate intrinsic value	$ 57,532
Vested and expected to vest, end of period, weighted-average remaining contractual life	6 years 9 months 22 days
Vested and expected to vest, end of period, aggregate intrinsic value	$ 57,187
Exercisable, end of period, weighted-average remaining contractual life	6 years 8 months 19 days
Exercisable, end of period, aggregate intrinsic value	$ 47,457
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Available for Grant [Roll Forward]
Restricted stock units granted (shares)	(593,003)	(508,729)	(1,205,200)
Restricted stock units canceled (shares)	174,094	157,358	163,689
Restricted stock units withheld for tax (shares)	259,107	311,368	85,661