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Debt, Net - Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense—stated coupon rate | $ 3,651 | $ 4,064 | $ 7,293 | $ 7,588
Interest expense—amortization of debt discount | 2,464 | 2,415 | 4,892 | 4,901
Total interest expense—convertible notes | 6,115 | 6,479 | 12,185 | 12,489
Cabot Senior Secured Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total interest expense—convertible notes | 21,358 | 24,046 | 42,842 | 47,122
Interest Expense | Cabot Senior Secured Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense—stated coupon rate | 21,239 | 25,011 | 42,839 | 48,993
Interest expense—amortization of debt discount | 119 | 116 | 3 | 226
Interest Income | Cabot Senior Secured Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense—amortization of debt discount | $ 0 | $ (1,081) | $ 0 | $ (2,097)

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