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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
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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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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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