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Long-Term Debt - Convertible Senior Notes Due 2022 (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2016 USD ($) $ / shares | Mar. 31, 2012 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  |  | $ 479,161 |  |
Unamortized debt discount |  |  | (28,802) | $ (14,406) |
Interest expense |  |  | 32,617 | 38,274 | $ 45,110
Convertible Senior Notes Maturing May 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | $ 125,000 |  | 125,000 | 125,000 |
Interest rate (as a percent) | 4.25% |  |  |  |
Frequency of periodic payment | semi-annually |  |  |  |
Maturity date | May 01, 2022 |  |  |  |
Initial conversion ratio | 0.0719748 |  |  |  |
Initial conversion price per share (in dollars per share) | $ / shares | $ 13.89 |  |  |  |
Redemption price as a percentage of principal amount | 100.00% |  |  |  |
Minimum percentage in aggregate principal amount | 25.00% |  |  |  |
Unamortized debt discount | $ (16,900) |  | (11,043) | (13,900) |
Carrying amount of equity component | $ 11,000 |  |  |  |
Effective interest rate (as a percent) | 7.30% |  |  |  |
Interest expense |  |  | 8,100 | 7,900 | $ 1,300
Convertible Senior Notes Maturing March 2032 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 200,000 | $ 0 | $ 60,115 |
Interest rate (as a percent) |  | 3.25% |  |  |
Maturity date |  | Mar. 15, 2032 |  |  |

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- Definition Minimum percentage in aggregate principal amount then outstanding holders of the notes are required to have in order to declare the entire principal amount of all the notes, and the interest accrued on such notes, if any, to be immediately due and payable pursuant to customary terms and covenants, including that upon certain events of default occurring and continuing. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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