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Equity Incentive Plans Schedule of Unvested Restricted Stock Units Activity (Details) - RSUs - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary of Expected to Vest RSUs [Line Items]        
Unvested RSUs, shares 1,981,292 2,151,232 2,558,213 2,351,362
RSUs granted, shares 926,051 664,897 924,312  
RSUs vested, shares (994,130) (975,462) (594,961)  
RSUs forfeited/canceled, shares (101,861) (96,416) (122,500)  
RSUs expected to vest, shares 1,940,820      
Unvested RSUs, weighted average grant date fair value $ 24.19 $ 20.97 $ 16.63 $ 14.02
RSUs granted, weighted average grant date fair value 27.08 31.82 22.18  
RSUs vested, weighted average grant date fair value 19.87 17.01 15.05  
RSUs forfeited/canceled, weighted average grant date fair value 24.66 $ 20.73 $ 16.25  
RSUs expected to vest, weighted average grant date fair value $ 24.13      
RSUs expected to vest, weighted average remaining contractual term 2 years 4 months      
RSUs expected to vest, aggregate intrinsic value $ 57,506