Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2018

Compensation And Retirement Disclosure [Abstract]

Schedule of Multiemployer Plans

Trusts employer

identification

Funding plan

Company contributions to the Trust

Pension

number /

PPA zone status

pending /

(dollars in thousands)

Surcharge

fund

plan number

2018

2017

implemented

2018

2017

2016

imposed

Trust

23-6648508 / 499

Green

Green

No

$

880

$

773

$

681

No