Other Long-Term Liabilities

12 Months Ended

Dec. 31, 2017

Other Long-Term Liabilities [Abstract]

Other Long-Term Liabilities

11. Other Long-Term Liabilities

Other long-term liabilities consist primarily of the Cash Conversion Derivative (at December 31, 2016 only), accrued severance and restructuring liabilities, deferred rent (see Note 12), and a deferred compensation plan.

We have a non-qualified deferred compensation plan under which certain employees may defer a portion of their salaries and receive a Company matching contribution plus a discretionary contribution based on the Company's performance against targets (the "Plan"). Company contributions vest equally over four years. We do not fund the Plan and carry it as an unsecured obligation. In December 2017, the Board of Directors of the Company determined effective as of December 31, 2017 to (i) cease deferrals and Company matching and discretionary contributions under the Plan and to freeze any additional growth additions under the Plan; (ii) fully vest the participants in their account balance(s) under the Plan; and (iii) terminate the Plan and distribute to participants the vested benefits accrued thereunder in accordance with the Plan and applicable regulations under the Internal Revenue Code.

As of December 31, 2017 and 2016, other long-term liabilities included vested amounts under the Plan of $1.3 million and $1.6 million, respectively.  The current portions under the Plan (recorded in current portion of long-term liabilities) were $1.3 million and $5.9 million as of December 31, 2017 and 2016, respectively. We must make estimated Plan payments of $1.3 million for each of 2018 and 2019.