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COMMITMENTS AND CONTINGENCIES (Tables)
 9 Months Ended
Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]  
Deferred FI implementation costs
The following table presents changes in deferred FI implementation costs (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2019
 
2018
 
2019
Beginning balance
$
12,425

 
$
12,181

 
$
13,625

 
$
15,877

Deferred costs
3,500

 
—

 
5,750

 
—

Recoveries through FI Share
(1,344
)
 
(1,157
)
 
(4,036
)
 
(3,469
)
Amortization
(378
)
 
(789
)
 
(1,136
)
 
(2,173
)
Ending balance
$
14,203

 
$
10,235

 
$
14,203

 
$
10,235