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Convertible Notes (Interest Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 17, 2017
Interest expense related to notes |  |  |  |
Amortization of debt issuance costs and discounts | $ 7,656 | $ 7,243 | $ 6,854 |
Convertible senior notes |  |  |  |
Interest expense related to notes |  |  |  |
Total interest expense on convertible notes | 10,028 | 9,615 | 9,226 |
Convertible senior notes | 1.375% convertible notes due 2023 |  |  |  |
Interest expense related to notes |  |  |  |
Coupon interest | 2,372 | 2,372 | 2,372 |
Amortization of debt issuance costs and discounts | $ 7,656 | $ 7,243 | $ 6,854 |
Debt instrument, interest rate, stated percentage | 1.375% | 1.375% | 1.375% | 1.375%
Debt instrument, interest rate, effective percentage | 4.90% | 4.90% | 4.90% |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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