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Indebtedness (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2011	Jun. 30, 2011
Debt Instrument [Line Items]
Short term senior convertible notes	$ 119,451
Long term senior convertible notes	555,493		$ 372,920
Total Senior Convertible Notes	674,944		372,920
2.75% Senior Convertible Notes [Member] \| Convertible Notes due 2017 [Member]
Debt Instrument [Line Items]
Principal amount	125,732	$ 125,732	402,500		$ 402,500
Unamortized debt discount	(5,508)	(6,800)	(25,958)	$ (88,900)
Unamortized debt issuance costs	(773)	(1,000)	(3,622)
Short term senior convertible notes	119,451		$ 372,920
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member]
Debt Instrument [Line Items]
Principal amount	650,000	$ 650,000
Unamortized debt discount	(80,403)
Unamortized debt issuance costs	(14,104)
Long term senior convertible notes	$ 555,493