Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Narrative) (Details)

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Acquisitions (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2015
Jan. 02, 2015
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Business Acquisition [Line Items]                
Revenues       $ 282,214,000 $ 223,732,000 $ 857,785,000 $ 656,303,000  
Net income       (2,937,000) $ 12,783,000 (8,986,000) $ 19,970,000  
Goodwill       125,877,000   $ 125,877,000   $ 115,238,000
Securities Service Network, Inc. (SSN)                
Business Acquisition [Line Items]                
Purchase price   $ 47,287,000            
Goodwill, deductible period for income tax purposes           15 years    
Revenues       28,535,000   $ 86,125,000    
Net income       343,000   961,000    
Cash paid in acquisition           25,000,000    
Identifiable intangible assets   30,901,000            
Goodwill   8,798,000            
Securities Service Network, Inc. (SSN) | Promissory Notes | 0.41% Promissory Notes                
Business Acquisition [Line Items]                
Notes payable - long term   $ 25,000,000            
Interest rate, stated percentage   0.41%            
Securities Service Network, Inc. (SSN) | Promissory Notes | 1.74% Promissory Notes                
Business Acquisition [Line Items]                
Notes payable - long term   $ 20,000,000            
Interest rate, stated percentage   1.74%            
Debt instrument, term   4 years            
Periodic payment   $ 18,697,000            
Imputed interest rate   5.10%            
Amount to be paid in excess of net worth of promissory notes   $ 3,590            
Select brokerage services Inc.(Select)                
Business Acquisition [Line Items]                
Purchase price $ 3,021,000              
Cash paid in acquisition 503,000              
Deferred payment on first anniversary 504,000              
Contingent consideration, liability 2,014,000              
Identifiable intangible assets 2,780,000              
Goodwill $ 241,000              
KMS Financial Services, Inc. and Securities Service Network, Inc. (SSN)                
Business Acquisition [Line Items]                
Non-recurring income tax benefit eliminated from the pro forma results           21,238,000    
Dalton                
Business Acquisition [Line Items]                
Purchase price     $ 2,689,000          
Cash paid in acquisition     2,100,000          
Contingent consideration, liability     $ 589,000          
Identifiable intangible assets       2,675,000   2,675,000    
Goodwill       $ 14,000   $ 14,000    
Earn out period           3 years