The following table presents our participation in these plans (amounts in thousands):



	Pension Plan Employer	Pension Protection Act (“PPA”) Certified Zone Status¹		FIP / RP Status Pending/Implemented²	Contributions						Surcharge Imposed	Expiration Date of Collective Bargaining Agreement³
Pension Trust Fund	Identification Number	2017	2016	FIP / RP Status Pending/Implemented²	2017		2016		2015		Surcharge Imposed	Expiration Date of Collective Bargaining Agreement³
Pension Trust Fund for Operating Engineers Pension Plan	94-6090764	Red	Red	Yes	$	2,477	$	2,145	$	2,151	No	Various
Laborers Pension Trust for Northern California	94-6277608	Yellow	Yellow	Yes	953		1,059		966		No	Various
Carpenter Funds Administrative Office	94-6050970	Red	Red	Yes	727		636		842		No	Various
Cement Mason Pension Trust Fund For Northern California	94-6277669	Yellow	Yellow	Yes	423		311		371		No	Various
All other funds⁴					8,006		8,487		10,204
				Total Contribution:	$	12,586	$	12,638	$	14,534

¹The most recent PPA zone status available in 2017 and 2016 is for the plan’s year-end during 2016 and 2015, respectively. The zone status is based on information that we received from the plan and is certified by the plan’s actuary. Among other factors, plans in the red zone are generally less than 65 percent funded, plans in the orange zone are less than 80 percent funded and have an Accumulated Funding Deficiency in the current year or projected into the next six years, plans in the yellow zone are less than 80 percent funded and plans in the green zone are at least 80 percent funded.

²Indicates whether the plan has a financial improvement plan (“FIP”) or a rehabilitation plan (“RP”) which is either pending or has been implemented.

³Lists the expiration date(s) of the collective-bargaining agreement(s) to which the plans are subject.

⁴These funds include multi-employer plans for pensions and other employee benefits. The total individually insignificant multi-employer pension costs contributed were $1.5 million, $1.2 million and $1.5 million for 2017, 2016 and 2015, respectively, and are included in the contributions to all other funds along with contributions to other types of benefit plans. Other employee benefits include certain coverage for medical, prescription drug, dental, vision, life and accidental death and dismemberment, disability and other benefit costs.