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Business Combinations, Goodwill and Intangible Assets (Narrative II) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Business Combinations [Abstract]          
Amount of Trademarks, customer lists, software and non-solicitation agreements $ 34,265   $ 34,265   $ 23,171
Aggregate amortization expense for intangible assets $ 853 $ 189 $ 1,364 $ 348