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Debt - 2016 Convertible Notes (Details Textual) $ / shares in Units, $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) Tradingday $ / shares | Sep. 30, 2015 USD ($) | Mar. 31, 2016 USD ($) | Mar. 15, 2016 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from long-term debt | $ 230,000 | $ 150,000 |  |  |
Long-term debt, unamortized original issue discount | $ 24,169 |  |  |  | $ 4,738
Senior Convertible Notes 2016 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior convertible notes face amount |  |  | $ 230,000 |  |
Interest rate on senior convertible notes | 4.25% |  | 4.25% |  |
Maturity date of 2016 convertible Notes | Mar. 15, 2036 |  |  |  |
Initial conversion rate of common stock | 17.4642 |  |  |  |
Convertible Notes, initial conversion of Par Value Convertible Notes to common stock | $ 1 |  |  |  |
Initial conversion price | $ / shares | $ 57.26 |  |  |  |
Percentage of par value of convertible notes to be settled in cash | 100.00% |  |  |  |
Rate of conversion price | 130.00% |  |  |  |
Debt instrument, convertible, threshold consecutive trading days | 20 days |  |  |  |
Debt instrument, convertible, threshold trading days | Tradingday | 30 |  |  |  |
Proceeds from long-term debt | $ 223,000 |  |  |  |
Long-term debt, unamortized original issue discount | $ 14,612 |  |  | $ 15,900 |
Effective interest rate of the liability | 5.63% |  |  |  |
2010 Convertible Notes Repurchased |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount of convertible notes repurchased | $ 115,300 |  |  |  |
Amount paid to purchase aggregate principal amount | $ 215,600 |  |  |  |

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- Definition The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 + Details
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