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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Contractual obligations |  |  |  |
Remainder of 2018 | [1] | $ 103,174 |  |
2019 | [1] | 18,202 |  |
2020 | [1] | 9,942 |  |
2021 | [1] | 7,204 |  |
2022 | [1] | 5,732 |  |
Contractual Obligation, Payments Due after Fourth Full Fiscal Year | [1] | 174,554 |  |
Contractual Obligation | [1] | 318,808 |  |
Unrecognized tax benefits |  | 24,000 |  | $ 22,600
Unrecognized tax benefits, reduction of long-term deferred tax assets |  | 21,600 |  | 20,400
Unrecognized tax benefits included in long-term income taxes payable |  | $ 2,400 |  | 2,200
Terms of noncancellable license agreement, minimum (in years) |  | 1 year |  |
Rent expense |  | $ 1,000 | $ 900 |
Deferred Rent Credit, Current |  | 700 |  | $ 500
Imputed financing obligation |  |  |  |
Contractual obligations |  |  |  |
Remainder of 2018 | [1],[2] | 4,854 |  |
2019 | [1],[2] | 6,602 |  |
2020 | [1],[2] | 2,869 |  |
2021 | [1],[2] | 0 |  |
2022 | [1],[2] | 0 |  |
Contractual Obligation, Payments Due after Fourth Full Fiscal Year | [1],[2] | 0 |  |
Contractual Obligation | [1],[2] | 14,325 |  |
Leases and other contractual obligations |  |  |  |
Contractual obligations |  |  |  |
Remainder of 2018 | [1] | 7,199 |  |
2019 | [1] | 5,696 |  |
2020 | [1] | 4,701 |  |
2021 | [1] | 4,832 |  |
2022 | [1] | 3,360 |  |
Contractual Obligation, Payments Due after Fourth Full Fiscal Year | [1] | 862 |  |
Contractual Obligation | [1] | 26,650 |  |
Software licenses |  |  |  |
Contractual obligations |  |  |  |
Remainder of 2018 | [1],[3] | 7,783 |  |
2019 | [1],[3] | 3,532 |  |
2020 | [1],[3] | 0 |  |
2021 | [1],[3] | 0 |  |
2022 | [1],[3] | 0 |  |
Contractual Obligation, Payments Due after Fourth Full Fiscal Year | [1],[3] | 0 |  |
Contractual Obligation | [1],[3] | 11,315 |  |
Convertible notes |  |  |  |
Contractual obligations |  |  |  |
Remainder of 2018 | [1] | 81,207 |  |
2019 | [1] | 0 |  |
2020 | [1] | 0 |  |
2021 | [1] | 0 |  |
2022 | [1] | 0 |  |
Contractual Obligation, Payments Due after Fourth Full Fiscal Year | [1] | 172,500 |  |
Contractual Obligation | [1] | 253,707 |  |
Interest payments related to convertible notes |  |  |  |
Contractual obligations |  |  |  |
Remainder of 2018 | [1] | 2,131 |  |
2019 | [1] | 2,372 |  |
2020 | [1] | 2,372 |  |
2021 | [1] | 2,372 |  |
2022 | [1] | 2,372 |  |
Contractual Obligation, Payments Due after Fourth Full Fiscal Year | [1] | 1,192 |  |
Contractual Obligation | [1] | $ 12,811 |  |
[1] | The above table does not reflect possible payments in connection with uncertain tax benefits of approximately $24.0 million including $21.6 million recorded as a reduction of long-term deferred tax assets and $2.4 million in long-term income taxes payable as of March 31, 2018. As noted below in Note 13, “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 unaudited condensed 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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