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Interest Expense (Interest Expense Schedule) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest Expense [Abstract]
Contractual interest on Convertible Debentures	$ 21,766	$ 15,234	$ 43,531	$ 30,469
Contractual interest on Notes	5,067	10,156	20,015	20,312
Amortization of debt discount on the Convertible Debentures	1,075	2,971	4,236	5,882
Credit facility and other interest expense	884	729	1,798	1,450
Total interest expense	$ 28,792	$ 29,090	$ 69,580	$ 58,113

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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