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Commitments and Contingencies (Details 2) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 17, 2017 | Aug. 16, 2013 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Contractual obligations |  |  |  |  |  |
Contractual Obligation, Due in Next Fiscal Year | [1] |  |  | $ 21,558 |  |
Contractual Obligation, Due in Second Year | [1] |  |  | 12,888 |  |
Contractual Obligation, Due in Third Year | [1] |  |  | 9,062 |  |
Contractual Obligation, Due in Fourth Year | [1] |  |  | 5,643 |  |
Contractual Obligation, Due in Fifth Year | [1] |  |  | 174,660 |  |
Contractual Obligation | [1] |  |  | $ 223,811 |  |
Terms of noncancellable license agreement, minimum (in years) |  |  |  | 1 year |  |
Rent expense |  |  |  | $ 5,200 | $ 4,400 | $ 3,800
Property, Plant and Equipment Cost Capitalization Amount |  |  |  | 40,320 | 40,320 |
Imputed financing obligation |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |
Contractual Obligation, Due in Next Fiscal Year | [1],[2] |  |  | 5,677 |  |
Contractual Obligation, Due in Second Year | [1],[2] |  |  | 2,404 |  |
Contractual Obligation, Due in Third Year | [1],[2] |  |  | 0 |  |
Contractual Obligation, Due in Fourth Year | [1],[2] |  |  | 0 |  |
Contractual Obligation, Due in Fifth Year | [1],[2] |  |  | 0 |  |
Contractual Obligation | [1],[2] |  |  | 8,081 |  |
Leases and other contractual obligations |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |
Contractual Obligation, Due in Next Fiscal Year | [1] |  |  | 5,999 |  |
Contractual Obligation, Due in Second Year | [1] |  |  | 5,117 |  |
Contractual Obligation, Due in Third Year | [1] |  |  | 5,193 |  |
Contractual Obligation, Due in Fourth Year | [1] |  |  | 3,271 |  |
Contractual Obligation, Due in Fifth Year | [1] |  |  | 968 |  |
Contractual Obligation | [1] |  |  | 20,548 |  |
Software licenses |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |
Contractual Obligation, Due in Next Fiscal Year | [1],[3] |  |  | 7,510 |  |
Contractual Obligation, Due in Second Year | [1],[3] |  |  | 2,995 |  |
Contractual Obligation, Due in Third Year | [1],[3] |  |  | 1,497 |  |
Contractual Obligation, Due in Fourth Year | [1],[3] |  |  | 0 |  |
Contractual Obligation, Due in Fifth Year | [1],[3] |  |  | 0 |  |
Contractual Obligation | [1],[3] |  |  | 12,002 |  |
Convertible notes |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |
Contractual Obligation, Due in Next Fiscal Year | [1] |  |  | 0 |  |
Contractual Obligation, Due in Second Year | [1] |  |  | 0 |  |
Contractual Obligation, Due in Third Year | [1] |  |  | 0 |  |
Contractual Obligation, Due in Fourth Year | [1] |  |  | 0 |  |
Contractual Obligation, Due in Fifth Year | [1] |  |  | 172,500 |  |
Contractual Obligation | [1] |  |  | 172,500 |  |
Interest payments related to convertible notes |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |
Contractual Obligation, Due in Next Fiscal Year | [1] |  |  | 2,372 |  |
Contractual Obligation, Due in Second Year | [1] |  |  | 2,372 |  |
Contractual Obligation, Due in Third Year | [1] |  |  | 2,372 |  |
Contractual Obligation, Due in Fourth Year | [1] |  |  | 2,372 |  |
Contractual Obligation, Due in Fifth Year | [1] |  |  | 1,192 |  |
Contractual Obligation | [1] |  |  | 10,680 |  |
Convertible notes | Senior, One Point One Two Five Percent Convertible Notes Due Two Thousand Eighteen [Member] |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |
Face Value |  |  | $ 138,000 | 0 | 81,207 |
Debt Instrument, Convertible, Remaining Discount Amortization Period |  |  | 5 years |  |  |
Convertible notes | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |
Face Value |  | $ 172,500 |  | $ 172,500 | $ 172,500 |
Debt Instrument, Convertible, Remaining Discount Amortization Period |  | 5 years |  | 4 years 1 month 2 days |  |
[1] | The above table does not reflect possible payments in connection with uncertain tax benefits of approximately $23.5 million including $21.4 million recorded as a reduction of long-term deferred tax assets and $2.1 million in long-term income taxes payable, as of December 31, 2018. As noted below in Note 16, “Income Taxes,” although it is possible that some of the unrecognized tax benefits could be settled within the next 12 months, the Company cannot reasonably estimate the outcome at this time.
[2] | With respect to the imputed financing obligation, the main components of the difference between the amount reflected in the contractual obligations table and the amount reflected on the Consolidated Balance Sheets are the interest on the imputed financing obligation and the estimated common area expenses over the future periods. The amount includes the amended Ohio lease and the amended Sunnyvale lease.
[3] | The Company has commitments with various software vendors for agreements generally having terms longer than one year.

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