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2.25% Convertible Senior Notes Due 2019 (Summary of Interest Expense for Contractual Interest and Accretion of Debt Discount) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
2.25% Convertible Senior Notes Due 2019 [Abstract]
Contractual coupon interest expense	$ 1,856	$ 1,856
Amortization of debt discount	2,248	2,128
Amortization of debt issuance costs	327	299
Total interest expense related to Notes	$ 4,431	$ 4,283

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Contractual coupon interest expense.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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