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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
2028 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Contractual coupon interest expense	$ 4,400		$ 9,142
Amortization of debt discount	5,968		12,285
Amortization of debt issuance costs	117		239
Total interest expense related to the Notes	10,485		21,666
2019 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Contractual coupon interest expense	372	$ 1,857	745	$ 3,713
Amortization of debt discount	532	2,508	1,063	5,016
Amortization of debt issuance costs	88	399	176	798
Total interest expense related to the Notes	$ 992	$ 4,764	$ 1,984	$ 9,527

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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.

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

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