BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 145,177	$ 134,569	$ 129,706	$ 123,775	$ 119,502	$ 120,330	$ 118,682	$ 111,001	$ 533,227	$ 469,515	$ 974,948
Games
Disaggregation of Revenue [Line Items]
Revenues									283,119	258,978	222,777
Games | Gaming Operations, Leased Equipment
Disaggregation of Revenue [Line Items]
Revenues									$ 143,200	136,600	126,100
Games | Gaming Operations, Leased Equipment | Minimum
Disaggregation of Revenue [Line Items]
Payment terms									30 days
Games | Gaming Operations, Leased Equipment | Maximum
Disaggregation of Revenue [Line Items]
Payment terms									90 days
Games | Gaming Operations, Wide Area Progressive (WAP) Systems | Minimum
Disaggregation of Revenue [Line Items]
Payment terms									30 days
Games | Gaming Operations, Wide Area Progressive (WAP) Systems | Maximum
Disaggregation of Revenue [Line Items]
Payment terms									90 days
Games | Gaming equipment and systems
Disaggregation of Revenue [Line Items]
Revenues									$ 90,919	87,038	70,118
Games | Gaming equipment and systems | Minimum
Disaggregation of Revenue [Line Items]
Term of contract									30 days
Games | Gaming equipment and systems | Maximum
Disaggregation of Revenue [Line Items]
Payment terms									39 months
Term of contract									180 days
Games | Gaming other
Disaggregation of Revenue [Line Items]
Revenues									$ 3,326	3,794	4,005
Games | Gaming other | Minimum
Disaggregation of Revenue [Line Items]
Term of contract									30 days
Games | Gaming other | Maximum
Disaggregation of Revenue [Line Items]
Term of contract									90 days
FinTech
Disaggregation of Revenue [Line Items]
Revenues									$ 250,108	210,537	752,171
FinTech | Equipment
Disaggregation of Revenue [Line Items]
Revenues									37,865	20,977	13,258
Contracts accounted for under topic 842									$ 2,600
FinTech | Equipment | Minimum
Disaggregation of Revenue [Line Items]
Payment terms									30 days
FinTech | Equipment | Maximum
Disaggregation of Revenue [Line Items]
Payment terms									90 days
FinTech | Information services and other
Disaggregation of Revenue [Line Items]
Revenues									$ 47,502	$ 32,754	$ 31,691
FinTech | Information services and other | Minimum
Disaggregation of Revenue [Line Items]
Payment terms									30 days
FinTech | Information services and other | Maximum
Disaggregation of Revenue [Line Items]
Payment terms									90 days