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Indebtedness (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2011	Jun. 30, 2011
Debt Instrument [Line Items]
Short-term Senior Convertible Notes	$ 61,701
Long-term Senior Convertible Notes	564,412		$ 372,920
Total Senior Convertible Notes	626,113		372,920
2.75% Senior Convertible Notes [Member] \| Convertible Notes due 2017 [Member]
Debt Instrument [Line Items]
Principal amount	63,317		402,500		$ 402,500
Unamortized debt discount	(1,417)	$ (1,400)	(25,958)	$ (88,900)
Unamortized debt issuance costs	(199)	(200)	(3,622)
Short-term Senior Convertible Notes	61,701		$ 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	(72,713)
Unamortized debt issuance costs	(12,875)
Long-term Senior Convertible Notes	$ 564,412