Investment (Tables)

12 Months Ended

Dec. 31, 2016

Amboy Aggregates [Member]

Schedule Of Equity Method Investments [Line Items]

Equity Method Investments

The Company accounts for this investment under the equity method. The following is summarized financial information for this entity:

		2016		2015			2014
Revenue	$	—	$	139		$	13,784
Gross profit (loss)		758		(1,363	)		(118	)
Income (loss) from continuing operations		758		(3,152	)		11,326
Net income (loss)		758		(3,152	)		9,527

Lower Main Street Development [Member]

Schedule Of Equity Method Investments [Line Items]

Equity Method Investments

The Company accounts for this investment under the equity method. The following is summarized financial information for this entity:

		2015		2014
Revenue	$	—	$	180
Gross profit		—		180
Net income		28		14,803

TerraSea Environmental Solutions [Member]

Schedule Of Equity Method Investments [Line Items]

Equity Method Investments

The Company accounts for this investment under the equity method. The following is summarized financial information for this entity:

		2016			2015			2014
Revenue	$	—		$	6,960		$	11,278
Gross loss		(183	)		(3,800	)		(19,153	)
Net loss		(183	)		(3,800	)		(19,856	)