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Convertible Senior Notes, Warrants, and Hedges - Components (Details) - USD ($)
$ in Thousands
Jul. 01, 2018
Apr. 01, 2018
Nov. 03, 2015
Liability component      
Outstanding principal, net of unamortized debt issuance costs $ 303,166 $ 299,551  
Convertible debt | 0.875% Convertible Senior Notes Due 2022      
Liability component      
Principal     $ 274,435
Less: Issuance cost     (7,568)
Outstanding principal, net of unamortized debt issuance costs $ 303,166 $ 299,551 266,867
Equity component      
Allocated amount     99,316
Less: Issuance cost     (2,738)
Net carrying amount     $ 96,578