EMPLOYEE BENEFIT PLANS

Defined contribution plans

We sponsor defined contribution retirement plans in which the majority of employees are eligible to participate. Our contributions to the defined contribution plans were $2.4 million, $1.9 million, and $1.1 million for the years ended December 31, 2015, 2014 and 2013, respectively.

Pension plans

We sponsor a defined benefit pension plan and a supplemental defined benefit pension plan (collectively, the “Pension Plans”) for certain employees of the SemCAMS segment hired before June 30, 2001. These plans are closed to new participants and do not accrue any additional benefits.

We recognize the funded status of the Pension Plans, measured as the difference between the fair value of the plan assets and the projected benefit obligation, in the Consolidated Balance Sheets. The table below summarizes the balances of the projected benefit obligation and fair value of the plan assets at December 31, 2015 and 2014 (in thousands):



	December 31,
	2015			2014
Projected benefit obligation	$	23,865		$	29,266
Fair value of plan assets	22,204			26,368
Funded status:	$	(1,661	)	$	(2,898	)

All of the plan's assets are invested in pooled funds that hold highly-liquid securities and are classified as Level 2 within the fair value hierarchy. We recorded other noncurrent liabilities of $1.7 million and $2.9 million at December 31, 2015 and 2014, respectively, to reflect the funded status of the Pension Plans.

We record changes in the funded status of the Pension Plans to other comprehensive income (loss), net of income taxes. These amounts were a gain of $0.7 million, a loss of $3.7 million and a gain of $4.8 million for the years ended December 31, 2015, 2014 and 2013, respectively.

Retiree medical plan

We sponsor an unfunded, post-employment health benefit plan (the “Health Plan”) for certain employees of the SemCAMS segment. The projected benefit obligation related to the Health Plan was $1.4 million at December 31, 2015 and $1.7 million at December 31, 2014, and is reported within other noncurrent liabilities on the consolidated balance sheets.