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Interest Expense (Interest Expense Schedule) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest Expense [Abstract]
Contractual interest on Convertible Debentures	$ 21,766	$ 21,403	$ 65,297	$ 51,872
Contractual interest on Notes	0	12,426	20,015	32,738
Amortization of debt discount on the Convertible Debentures	0	3,034	4,236	8,916
Credit facility and other interest expense	865	893	2,663	2,343
Total interest expense	$ 22,631	$ 37,756	$ 92,211	$ 95,869

X

- Definition

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.

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

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Amount of interest expense classified as other.

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Interest expense incurred during the reporting period on subordinated notes and debentures. Includes amortization of expenses incurred in the issuance of subordinated notes and debentures.

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