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Intangible Assets and Unfavorable Lease Terms (Schedule 2) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Intangible Assets And Unfavorable Lease Terms [Abstract]
Unfavorable leases terms	$ 0	$ 665	$ 1,997
Favorable leases terms charter out	(37,295)	(33,311)	(19,685)
Favorable leases terms charter in			(2)
Total	$ (37,295)	$ (32,646)	$ (17,690)

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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