Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets (Details 2)

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Goodwill and Intangible Assets (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Amortization expense for intangible assets      
Amortization expense $ 6,165 $ 935 $ 1,117