401(k) Savings Plan

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

401(k) Savings Plan

401(k) Savings Plan

Almost all of our U.S. employees are eligible to participate in our 401(k) savings plan. We match a portion of the employees' contribution and the vesting of this matching contribution occurs over six years.  Forfeitures reduce our matching contributions.  We record forfeitures when a participant's employment ends.  We recorded expense of $1.3 million, $1.3 million and $1.3 million in 2015, 2014 and 2013, respectively, related to this plan.