Goodwill and Other Intangibles (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of changes in the carrying amount of goodwill
Goodwill, gross	$ 82,817	$ 46,327	$ 38,240
Additions	36,490	8,087
Impairments
Accumulated impairment losses	(38,240)	(38,240)	(38,240)
Accumulated additions
Accumulated Impairments
Goodwill, Beginning Balance	8,087
Goodwill net additions	36,490	8,087
Goodwill net impairments
Goodwill, Ending Balance	$ 44,577	$ 8,087

Goodwill accumulated additions.

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Goodwill net additions.

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Goodwill net impairments.

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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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The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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Gross amount, as of the balance sheet date, of 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), in excess of the fair value of net assets acquired in one or more business combination transactions.

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The accumulated impairment losses related to goodwill as of the balance sheet date.

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The amount of an adjustment to a previously reported goodwill impairment charge, which will be recognized in the subsequent reporting period.

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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.

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