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Interest Expense (Interest Expense Schedule) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Contractual interest on Convertible Debentures	$ 10,156	$ 10,156
Contractual interest on Notes	15,235	9,037
Amortization of debt discount on the Convertible Debentures	2,689	2,477
Credit facility and other interest expense	724	347
Total interest expense	$ 28,804	$ 22,017

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-Section S99
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- Definition

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

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-Publisher FASB
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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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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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