Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets (Details Textual)

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Goodwill and Other Intangible Assets (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Goodwill and Other Intangible Assets (Textual) [Abstract]        
Amortization of intangible assets $ 9,549 $ 6,871 $ 18,943 $ 13,137