Annual report pursuant to Section 13 and 15(d)

Acquisitions (Pro Forma) (Details)

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Acquisitions (Pro Forma) (Details) - KMS Financial Services, Inc. and Securities Service Network, Inc. (SSN) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Revenue   $ 1,130,420 $ 936,785
Net income (loss)   12,754 (5,475)
Net loss available to common shareholders   $ (4,409) $ (12,386)
Basic and diluted net loss per share available to common shareholders   $ (0.02) $ (0.07)
Weighted average common shares outstanding: Basic and diluted   185,370,262 186,277,160
Stock issued in acquisition, shares 3,981,684