Goodwill (Details Textual) (USD $)	3 Months Ended	12 Months Ended
Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill Impairment (Textual) [Abstract]
Goodwill before impairment		$ 28,300,000
Impairment loss	$ 28,300,000	$ 28,306,000	$ 0	$ 0

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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+ Details