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Goodwill and Identifiable Intangible Assets, Net (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 12 Months Ended
Oct. 02, 2012
item
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Virginia, Maryland and North Carolina markets
item
Dec. 31, 2010
Delaware location
Dec. 31, 2012
Income valuation approach using discounted cash flow model
Dec. 31, 2011
Income valuation approach using discounted cash flow model
Dec. 31, 2010
Income valuation approach using discounted cash flow model
Dec. 31, 2012
Public company market approach
Dec. 31, 2011
Public company market approach
Dec. 31, 2010
Public company market approach
Dec. 31, 2012
Transaction approach
Dec. 31, 2010
Transaction approach
Changes in the carrying amount of goodwill                          
Balance at the beginning of period   $ 107,093 $ 147,818                    
Additions   7,495 16,629                    
Impairment adjustment     (57,354) (57,300) (5,700)                
Balance at the end of period   $ 114,588 $ 107,093                    
Weight assigned to the public company approach for impacted reporting units, percentage                 50.00%        
Weighting percentage           50.00% 50.00% 50.00% 40.00% 50.00% 40.00% 10.00% 10.00%
Number of reporting units for which the fair value exceeded the carrying value by a significant margin 23                        
Number of reporting units, which could no longer support the related goodwill balance       4