SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES Tax Receivable Agreements (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Tax receivable agreement    
Tax Receivable Agreement, Cash Savings Percent 15.00%  
Payments Under Tax Receivable Agreements $ 22,805 $ 8,639
Fifth Third    
Tax receivable agreement    
Payments to pre-IPO investors as percentage of cash saving in income tax 85.00%  
Mercury Payment Systems, LLC    
Tax receivable agreement    
Tax Receivable Agreement Payments as Percentage of Cash Savings in Tax 85.00%