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Goodwill and Intangibles Assets (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Goodwill and intangibles assets (Textual) [Abstract]
Amortization of intangible assets	$ 1,436	$ 338	$ 1,860	$ 675
Impairment charges	0	0	0	0
ICG Group, Inc [Member]
Goodwill and intangibles assets (Textual) [Abstract]
Amortization of intangible assets	$ 1,400	$ 300	$ 1,900	$ 700

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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