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Convertible Notes (Interest Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 17, 2017 | Aug. 16, 2013
Interest expense related to notes |  |  |  |  |
Amortization of Debt Issuance Costs and Discounts | $ 9,243 | $ 7,578 | $ 6,749 |  |
Additional paid in capital | $ 1,226,588 | $ 1,212,798 |  |  |
Convertible Senior Notes [Member] | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.375% |  |  | 1.375% |
Convertible Senior Notes [Member] | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.125% | 1.125% |  |  | 1.125%
Convertible notes |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Total interest expense on convertible notes | $ 11,991 | $ 9,356 | 8,302 |  |
Additional paid in capital | 111,300 | 111,300 |  |  |
Convertible notes | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Coupon interest | 2,372 | 290 |  |  |
Amortization of Debt Issuance Costs and Discounts | $ 6,486 | 768 |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.90% |  |  |  |
Debt Instrument, Face Amount | $ 172,500 | 172,500 |  | $ 172,500 |
Convertible notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Coupon interest | 377 | 1,488 | 1,553 |  |
Amortization of Debt Issuance Costs and Discounts | $ 2,756 | $ 6,810 | $ 6,749 |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.50% | 5.50% |  |  |
Debt Instrument, Face Amount | $ 0 | $ 81,207 |  |  | $ 138,000

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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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