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Segment Information (Narrative) (Details) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Segment Information [Line Items]    
Total revenues$ 260,401$ 247,616$ 769,445$ 743,554
London Operation [Member]
    
Segment Information [Line Items]    
Total revenues$ 2,100$ 2,200$ 7,200$ 8,100