Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Amortization expense) (Details)

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Intangible Assets (Amortization expense) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Intangible Assets [Abstract]        
Amortization expense $ 1,324 $ 1,583 $ 2,625 $ 3,156