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Commitments and Contingencies (Details 2) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Aug. 16, 2013 USD ($) | Dec. 31, 2012 USD ($) | Jun. 03, 2011 USD ($) installment | Jul. 10, 2009 USD ($) | Jun. 29, 2009 USD ($)
Contractual obligations |  |  |  |  |  |  |  |  |
Contractual Obligation, Due in Next Fiscal Year | [1] | $ 14,457 |  |  |  |  |  |  |
Contractual Obligation, Due in Second Year | [1] | 9,973 |  |  |  |  |  |  |
Contractual Obligation, Due in Third Year | [1] | 146,735 |  |  |  |  |  |  |
Contractual Obligation, Due in Fourth Year | [1] | 6,812 |  |  |  |  |  |  |
Contractual Obligation, Due in Fifth Year | [1] | 2,869 |  |  |  |  |  |  |
Contractual Obligation, Due after Fifth Year | [1] | 0 |  |  |  |  |  |  |
Contractual Obligation | [1] | 180,846 |  |  |  |  |  |  |
Unrecognized Tax Benefits |  | 20,836 | $ 19,903 | $ 18,794 |  | $ 16,773 |  |  |
Unrecognized tax benefits, reduction of long-term deferred tax assets, before federal tax benefit |  | 18,600 | 17,800 |  |  |  |  |  |
Unrecognized tax benefits included in long-term income taxes payable |  | $ 2,200 | 2,100 |  |  |  |  |  |
Terms of noncancellable license agreement, minimum (in years) |  | 1 year |  |  |  |  |  |  |
Rent expense |  | $ 2,700 | 2,600 | $ 3,100 |  |  |  |  |
Property, Plant and Equipment Cost Capitalization Amount |  | 40,320 | 40,320 |  |  |  |  |  |
CRD [Member] [Domain] |  |  |  |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |  |  |  |
Number of installments for payment of retention bonus | installment |  |  |  |  |  |  | 3 |  |
Approximate installment amount of retention bonus |  |  |  |  |  |  | $ 16,700 |  |
Imputed financing obligation |  |  |  |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |  |  |  |
Contractual Obligation, Due in Next Fiscal Year | [1],[2] | 6,156 |  |  |  |  |  |  |
Contractual Obligation, Due in Second Year | [1],[2] | 6,302 |  |  |  |  |  |  |
Contractual Obligation, Due in Third Year | [1],[2] | 6,447 |  |  |  |  |  |  |
Contractual Obligation, Due in Fourth Year | [1],[2] | 6,602 |  |  |  |  |  |  |
Contractual Obligation, Due in Fifth Year | [1],[2] | 2,869 |  |  |  |  |  |  |
Contractual Obligation, Due after Fifth Year | [1],[2] | 0 |  |  |  |  |  |  |
Contractual Obligation | [1],[2] | 28,376 |  |  |  |  |  |  |
Leases and other contractual obligations |  |  |  |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |  |  |  |
Contractual Obligation, Due in Next Fiscal Year | [1] | 4,321 |  |  |  |  |  |  |
Contractual Obligation, Due in Second Year | [1] | 1,569 |  |  |  |  |  |  |
Contractual Obligation, Due in Third Year | [1] | 546 |  |  |  |  |  |  |
Contractual Obligation, Due in Fourth Year | [1] | 210 |  |  |  |  |  |  |
Contractual Obligation, Due in Fifth Year | [1] | 0 |  |  |  |  |  |  |
Contractual Obligation, Due after Fifth Year | [1] | 0 |  |  |  |  |  |  |
Contractual Obligation | [1] | 6,646 |  |  |  |  |  |  |
Software licenses |  |  |  |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |  |  |  |
Contractual Obligation, Due in Next Fiscal Year | [1],[3] | 2,427 |  |  |  |  |  |  |
Contractual Obligation, Due in Second Year | [1],[3] | 549 |  |  |  |  |  |  |
Contractual Obligation, Due in Third Year | [1],[3] | 190 |  |  |  |  |  |  |
Contractual Obligation, Due in Fourth Year | [1],[3] | 0 |  |  |  |  |  |  |
Contractual Obligation, Due in Fifth Year | [1],[3] | 0 |  |  |  |  |  |  |
Contractual Obligation, Due after Fifth Year | [1],[3] | 0 |  |  |  |  |  |  |
Contractual Obligation | [1],[3] | 3,166 |  |  |  |  |  |  |
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] | 138,000 |  |  |  |  |  |  |
Contractual Obligation, Due in Fourth Year | [1] | 0 |  |  |  |  |  |  |
Contractual Obligation, Due in Fifth Year | [1] | 0 |  |  |  |  |  |  |
Contractual Obligation, Due after Fifth Year | [1] | 0 |  |  |  |  |  |  |
Contractual Obligation | [1] | 138,000 |  |  |  |  |  |  |
Interest payments related to convertible notes |  |  |  |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |  |  |  |
Contractual Obligation, Due in Next Fiscal Year | [1] | 1,553 |  |  |  |  |  |  |
Contractual Obligation, Due in Second Year | [1] | 1,553 |  |  |  |  |  |  |
Contractual Obligation, Due in Third Year | [1] | 1,552 |  |  |  |  |  |  |
Contractual Obligation, Due in Fourth Year | [1] | 0 |  |  |  |  |  |  |
Contractual Obligation, Due in Fifth Year | [1] | 0 |  |  |  |  |  |  |
Contractual Obligation, Due after Fifth Year | [1] | 0 |  |  |  |  |  |  |
Contractual Obligation | [1] | 4,658 |  |  |  |  |  |  |
Convertible notes | 5% Convertible Senior Notes due 2014 |  |  |  |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |  |  |  |
Face Value |  |  |  |  |  |  |  | $ 22,500 | $ 150,000
Convertible notes | Senior, One Point One Two Five Percent Convertible Notes Due Two Thousand Eighteen [Member] |  |  |  |  |  |  |  |  |
Contractual obligations |  |  |  |  |  |  |  |  |
Face Value |  | $ 138,000 | $ 138,000 |  | $ 138,000 |  |  |  |
[1] | The above table does not reflect possible payments in connection with uncertain tax benefits of approximately $20.8 million including $18.6 million recorded as a reduction of long-term deferred tax assets and $2.2 million in long-term income taxes payable, as of December 31, 2015. 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 non-cancellable agreements generally having terms longer than one year.

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