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Goodwill (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Indefinite-lived Intangible Assets [Line Items]
Goodwill and intangible assets impairment	$ 0		$ 29,337,000
Goodwill (Textual) [Abstract]
Purchases of intangible assets			22,800,000
Carrying amount of goodwill	0			0	19,800,000
Goodwill impairment charges		13,200,000	6,600,000
Goodwill [Member]
Indefinite-lived Intangible Assets [Line Items]
Goodwill and intangible assets impairment			$ 6,600,000

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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