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Debt and Credit Facility - Components (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | May 31, 2018
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Debt Instrument [Line Items] |  |  |  |
Amount of unamortized debt discount of debentures | $ (1,177,900) |  | $ (1,268,700) |
Debt issuance cost | (70,900) |  | (83,600) |
Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance cost |  | $ (1,750) |  |
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of unamortized debt discount of debentures |  |  |  | $ (10,500)
Debt issuance cost |  |  |  | (24,400)
Senior Notes | 2023 Senior Secured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of unamortized debt discount of debentures | (3,700) |  | (4,400) |
Debt issuance cost | (8,300) |  | (10,200) |
Senior Notes | 2021 Senior Secured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of unamortized debt discount of debentures | (2,600) |  | (3,800) |
Debt issuance cost | (5,800) |  | (8,800) |
Senior Subordinated Convertible Debt | 2017 Senior Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of unamortized debt discount of debentures | (518,900) |  | (561,900) |
Debt issuance cost | (13,400) |  | (14,500) |
Senior Subordinated Convertible Debt | 2015 Senior Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of unamortized debt discount of debentures | (312,800) |  | (351,400) |
Debt issuance cost | (11,400) |  | (12,800) |
Junior Subordinated Debt | 2017 Junior Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of unamortized debt discount of debentures | (339,900) |  | (347,200) |
Debt issuance cost | (3,100) |  | (3,200) |
Revolving Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance cost | (13,600) |  | (14,700) |
Term Loan Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance cost | $ (15,300) |  | $ (19,400) | $ (34,700)

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