Annual report pursuant to Section 13 and 15(d)

Intangible Assets (Amortization expense) (Details)

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Intangible Assets (Amortization expense) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Intangible Assets [Abstract]      
Amortization expense $ 5,227 $ 6,039 $ 6,360