Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2015

Retirement Plans [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	2015	2014	implemented		2015		2014		2013	imposed
Trust	23-6648508 / 499	Green	Green	No	$	737	$	758	$	668	No