Fair Value Measurements (Fair Value Measurements Used in Testing Impairment of Long-lived Assets and Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Vessels, Property, and Other Equipment, net	$ 375	[1]
Assets Held for Sale	6,133	[2]
Impairment Losses, Vessels, Property, and Other Equipment, net	(1,370)	[1]
Impairment Losses, Assets Held for Sale	(564)	[2]
Level 3 Inputs [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Vessels, Property, and Other Equipment, net	375	[1]
Assets Held for Sale	$ 6,133	[2]

[1] Refers to our Jones Act inactive barge, inactive harbor tug, and belt self-unloading bulk carrier.

[2] Refers to our Jones Act inactive tug and our New Orleans office building included in current assets held for sale at March 31, 2016.