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Convertible Notes (Interest Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 17, 2017 | Aug. 16, 2013
Interest expense related to notes |  |  |  |  |
Amortization of Debt Issuance Costs and Discounts | $ 7,578 | $ 6,749 | $ 6,372 |  |
Additional paid in capital | $ 1,212,798 | $ 1,181,230 |  |  |
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 | $ 9,356 | $ 8,302 | 7,939 |  |
Additional paid in capital | 111,300 | 93,400 |  |  |
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 | 290 |  |  |  |
Amortization of Debt Issuance Costs and Discounts | $ 768 |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.90% |  |  |  |
Debt Instrument, Face Amount | $ 172,500 | 0 |  | $ 172,500 |
Convertible notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Coupon interest | 1,488 | 1,553 | 1,567 |  |
Amortization of Debt Issuance Costs and Discounts | $ 6,810 | $ 6,749 | $ 6,372 |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.50% | 5.50% |  |  |
Debt Instrument, Face Amount | $ 81,207 | $ 138,000 |  |  | $ 138,000

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- Definition Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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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/presentationRef -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=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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