RETIREMENT PLANS

6 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

RETIREMENT PLANS

RETIREMENT PLANS

The Company maintains defined benefit pension plans that cover certain employees in France, Japan, Germany and Switzerland.

Net periodic benefit costs for the Company’s defined benefit pension plans for three and the six months ended June 30, 2021 were $0.6 million and $1.2 million. The components of the net periodic benefit costs other than the service cost component of $0.8 million and $1.7 million for the three and six months ended June 30, 2021, are included in other income (expense), net in the consolidated statements of operations.

Net periodic benefit costs for the Company’s defined benefit pension plans for the three and six months ended June 30, 2020 were $1.0 million and $1.9 million, respectively. The components of the net periodic benefit costs other than the service cost component of $0.9 million and $1.9 million for the three and six months ended June 30, 2020, respectively, are included in other income (expense), net in the consolidated statements of operations.

The estimated fair values of plan assets were $33.8 million and $37.8 million as of June 30, 2021 and December 31, 2020, respectively. The net plan assets of the pension plans are invested in common trusts as of June 30, 2021 and December 31, 2020. Common trusts are classified as Level 2 in the fair value hierarchy. The fair value of common trusts is valued at the net asset value based on the fair values of the underlying investments of the trusts as determined by the sponsor of the trusts. The investment strategy of the Company's defined benefit plans is both to meet the liabilities of the plans as they fall due and to maximize the return on invested assets within an appropriate risk profile.

Deferred Compensation Plan

The Company maintains a Deferred Compensation Plan in which certain employees of the Company may defer the payment and taxation of up to 75% of their base salary and up to 100% of bonus amounts and other eligible cash compensation.

During the first quarter of 2020, employees participating in the Company's deferred compensation plan began to defer their compensation. This deferred compensation is invested in funds offered under this plan and is valued based on Level 1 measurements in the fair value hierarchy. Assets of the Company's deferred compensation plan are included in other current assets and recorded at fair value based on their quoted market prices. The fair value of these assets were $3.2 million and $2.0 million as of June 30, 2021 and December 31, 2020, respectively. Offsetting liabilities relating to the deferred compensation plan are included in Other liabilities.