Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

At December 31, 2017 and 2016, property, plant and equipment consisted of the following:

	Depreciable Lives	2017		2016
Land	—	$	21,719	$	20,679
Improvements to land and buildings	10-25 years	135,896		135,852
Storage equipment	5-50 years	178,815		168,839
Marine vessels	4-25 years	176,782		181,659
Operating plant and equipment	3-50 years	659,854		620,303
Base Gas	—	43,799		43,799
Furniture, fixtures and other equipment	3-20 years	11,134		19,034
Transportation equipment	3-7 years	1,535		1,738
Construction in progress		23,531		32,374
		$	1,253,065	$	1,224,277