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Convertible Senior Notes (Summary of Interest Expense for Contractual Interest and Accretion of Debt Discount) (Details) - Convertible Senior Notes [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
2028 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Contractual coupon interest expense			$ 1,467
Amortization of debt discount			1,921
Amortization of debt issuance costs			36
Total interest expense related to the Notes			3,424
2019 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Contractual coupon interest expense	$ 1,361	$ 1,856	5,074	$ 5,569
Amortization of debt discount	1,891	2,440	6,907	7,188
Amortization of debt issuance costs	307	381	1,104	1,106
Total interest expense related to the Notes	$ 3,559	$ 4,677	$ 13,085	$ 13,863

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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 amortization expense attributable to debt issuance costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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