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Headquarter Relocation (Narrative) (Details) - USD ($) $ in Thousands | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Oct. 31, 2016 | Sep. 30, 2016
Prepaid expenses and other current assets | $ 17,162 | $ 17,162 | $ 21,602 |  |  |
Accrued expenses and other current liabilities | $ 41,489 | 41,489 | 38,920 |  |  |
Proceeds from sale of fixed assets |  | 652 | 64 | $ 110 |  |
Gain on sale of fixed assets |  | (48) | $ (74) | $ (110) |  |
Tenant improvements |  |  |  |  | $ 1,104 |
Tenant improvement liability |  |  |  |  | $ 1,104 |
Lease term | 10 years |  |  |  |  |
Non-Cash Build-to-Suit Lease Asset [Member] |  |  |  |  |  |
Prepaid expenses and other current assets |  |  |  |  |  | $ 4,322
Non-Cash Build-to-Suit Lease Liability [Member] |  |  |  |  |  |
Accrued expenses and other current liabilities |  |  |  |  |  | $ 4,322
Headquarter Relocation [Member] |  |  |  |  |  |
Headquarter relocation costs |  | $ 1,769 |  |  |  |

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