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Goodwill and Identifiable Intangible Assets, Net (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Dec. 31, 2012
Changes in the carrying amount of goodwill      
Balance at the beginning of year   $ 114,588 $ 114,588
Additions   24,503  
Impairment adjustment 727 727  
Balance at the end of period $ 138,364 $ 138,364 $ 114,588