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Deferred Revenue (Tables)
 6 Months Ended
Jun. 30, 2014
Deferred Revenue [Abstract]  
Deferred Revenue, by Arrangement, Disclosure
The following table summarizes the activity in deferred revenue for the six months ended June 30, 2014 (in thousands):

 
 
Balance at
December 31,
2013
 
Cash 
Additions
 
Revenue 
Recognition
 
Balance at June 30, 2014
Other – net
 
$
1,100

 
$
6,582

 
$
(4,370
)
 
$
3,312

Liquidity provider sliding scale (1)
 
—

 
15,800

 
(7,400
)
 
8,400

Total deferred revenue
 
$
1,100

 
$
22,382

 
$
(11,770
)
 
$
11,712


(1)  Liquidity providers are eligible to participate in the sliding scale program, which involves prepayment of transaction fees, and receive reduced fees based on the achievement of certain volume thresholds reached within a month. The prepayment of 2014 transaction fees totaled $15.8 million. This amount is amortized and recorded as transaction fees over the respective period.