Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2012
Income Taxes [Line Items]
Provision for income taxes	$ 373	$ 1,141	$ 405	$ 912
Loss before taxes and equity in net income of unconsolidated entities	(6,992)	$ (1,248)	(13,186)	$ (5,170)
Deferred gain from disposition of qualifying vessels remaining amount			16,400
Increase in valuation allowance			7,500
Qualified replacement property acquired	45,600
Deferred gain on disposal					$ 93,900	$ 79,300
Deferred tax liability related to controlled foreign corporations	4,700		4,700
Replacement Before December 31, 2015 [Member]
Income Taxes [Line Items]
Qualified replacement property acquired	25,000
Deferred gain on disposal	17,300		17,300
Replacement Years of 2018 [Member]
Income Taxes [Line Items]
Deferred gain on disposal	$ 7,700		$ 7,700