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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)

X

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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