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Acquisitions and Channel Partner Arrangements (Pro Forma Information) (Details) - ADP/COBRA/CHSA
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
Business Acquisition [Line Items]  
Total revenue | $ $ 469,119
Net income | $ $ 28,543
Net income per share:  
Net income per share, basic (USD per share) | $ / shares $ 0.78
Net income per share, diluted (USD per share) | $ / shares $ 0.77