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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Contractual obligations |  |  |  |  |  |
Remainder of 2017 | [1] | $ 13,023 |  | $ 13,023 |  |
2018 | [1] | 160,744 |  | 160,744 |  |
2019 | [1] | 13,648 |  | 13,648 |  |
2020 | [1] | 5,418 |  | 5,418 |  |
2021 | [1] | 2,646 |  | 2,646 |  |
Contractual Obligation, Payments Due after Fourth Full Fiscal Year | [1] | 1,293 |  | 1,293 |  |
Contractual Obligation | [1] | 196,772 |  | 196,772 |  |
Unrecognized tax benefits |  | 22,900 |  | 22,900 |  | $ 21,900
Unrecognized tax benefits, reduction of long-term deferred tax assets |  | 20,700 |  | 20,700 |  | 19,700
Unrecognized tax benefits included in long-term income taxes payable |  | 2,200 |  | $ 2,200 |  | 2,200
Terms of noncancellable license agreement, minimum (in years) |  |  |  | 1 year |  |
Rent expense |  | 1,100 | $ 900 | $ 2,100 | $ 1,700 |
Deferred Rent Credit, Current |  | 300 |  | 300 |  | $ 500
Imputed financing obligation |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |
Remainder of 2017 | [1],[2] | 3,185 |  | 3,185 |  |
2018 | [1],[2] | 6,447 |  | 6,447 |  |
2019 | [1],[2] | 6,602 |  | 6,602 |  |
2020 | [1],[2] | 2,869 |  | 2,869 |  |
2021 | [1],[2] | 0 |  | 0 |  |
Contractual Obligation, Payments Due after Fourth Full Fiscal Year | [1],[2] | 0 |  | 0 |  |
Contractual Obligation | [1],[2] | 19,103 |  | 19,103 |  |
Leases and other contractual obligations |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |
Remainder of 2017 | [1] | 4,213 |  | 4,213 |  |
2018 | [1] | 4,569 |  | 4,569 |  |
2019 | [1] | 3,514 |  | 3,514 |  |
2020 | [1] | 2,549 |  | 2,549 |  |
2021 | [1] | 2,646 |  | 2,646 |  |
Contractual Obligation, Payments Due after Fourth Full Fiscal Year | [1] | 1,293 |  | 1,293 |  |
Contractual Obligation | [1] | 18,784 |  | 18,784 |  |
Software licenses |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |
Remainder of 2017 | [1],[3] | 4,849 |  | 4,849 |  |
2018 | [1],[3] | 10,176 |  | 10,176 |  |
2019 | [1],[3] | 3,532 |  | 3,532 |  |
2020 | [1],[3] | 0 |  | 0 |  |
2021 | [1],[3] | 0 |  | 0 |  |
Contractual Obligation, Payments Due after Fourth Full Fiscal Year | [1],[3] | 0 |  | 0 |  |
Contractual Obligation | [1],[3] | 18,557 |  | 18,557 |  |
Convertible notes |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |
Remainder of 2017 | [1] | 0 |  | 0 |  |
2018 | [1] | 138,000 |  | 138,000 |  |
2019 | [1] | 0 |  | 0 |  |
2020 | [1] | 0 |  | 0 |  |
2021 | [1] | 0 |  | 0 |  |
Contractual Obligation, Payments Due after Fourth Full Fiscal Year | [1] | 0 |  | 0 |  |
Contractual Obligation | [1] | 138,000 |  | 138,000 |  |
Interest payments related to convertible notes |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |
Remainder of 2017 | [1] | 776 |  | 776 |  |
2018 | [1] | 1,552 |  | 1,552 |  |
2019 | [1] | 0 |  | 0 |  |
2020 | [1] | 0 |  | 0 |  |
2021 | [1] | 0 |  | 0 |  |
Contractual Obligation, Payments Due after Fourth Full Fiscal Year | [1] | 0 |  | 0 |  |
Contractual Obligation | [1] | $ 2,328 |  | $ 2,328 |  |
[1] | The above table does not reflect possible payments in connection with uncertain tax benefits of approximately $22.9 million including $20.7 million recorded as a reduction of long-term deferred tax assets and $2.2 million in long-term income taxes payable as of June 30, 2017. As noted below in Note 12, “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 non-cancellable agreements generally having terms longer than one year.

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