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Goodwill and Intangible Assets (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Indicators of impairment     $ 0  
Amortization expense of intangible assets $ 1,300 $ 700 $ 2,377 $ 1,472
Customer Relationships [Member]
       
Weighted-average remaining lives of intangible assets     7.2  
Trade Name [Member]
       
Weighted-average remaining lives of intangible assets     14.0  
Non-Compete Agreement [Member]
       
Weighted-average remaining lives of intangible assets     0.4