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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract] |
Lease Expense | Lease expense for the years ended December 31, 2018, 2017 and 2016 was as follows (in thousands):
| Operating Lease Expense |  | Sublease Income |  | Net Expense
2018 | $ | 3,363 |  |  | $ | 1,198 |  |  | $ | 2,165 |
2017 | $ | 4,924 |  |  | $ | 1,134 |  |  | $ | 3,790 |
2016 | $ | 5,100 |  |  | $ | 888 |  |  | $ | 4,212 |
Future Minimum Annual Non-cancelable Commitments - Leases | Future minimum annual non-cancelable commitments as of December 31, 2018 are as follows (in thousands):
| Operating Leases
| Lease Commitments |  | Sublease Income |  | Net Commitments
2019 | $ | 2,527 |  |  | $ | — |  |  | $ | 2,527 |
2020 | 1,479 |  |  | — |  |  | 1,479 |
2021 | 1,270 |  |  | — |  |  | 1,270 |
2022 | 1,189 |  |  | — |  |  | 1,189 |
2023 | 898 |  |  | — |  |  | 898 |
Thereafter | 167 |  |  | — |  |  | 167 |
Total | $ | 7,530 |  |  | $ | — |  |  | $ | 7,530 |
Future minimum annual non-cancelable commitments under our headquarters lease as of December 31, 2018, which are not included in the table above, are as follows (in thousands):
| Lease Commitments |  | Sublease Income |  | Net Commitments
2019 | $ | 4,456 |  |  | $ | 376 |  |  | $ | 4,080 |
2020 | 4,579 |  |  | — |  |  | 4,579 |
2021 | 4,705 |  |  | — |  |  | 4,705 |
2022 | 4,827 |  |  | — |  |  | 4,827 |
2023 | 4,948 |  |  | — |  |  | 4,948 |
Thereafter | 17,388 |  |  | — |  |  | 17,388 |
Total | $ | 40,903 |  |  | $ | 376 |  |  | $ | 40,527 |

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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- Definition Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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