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Revenue from Contracts with Customer - Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  | $ 167,620,000 | $ 128,109,000 | $ 112,862,000
Net income |  | $ 51,932,000 | $ 5,844,000 | $ 39,076,000 | $ 29,669,000 | $ 36,251,000 | $ 20,427,000 | $ 19,981,000 | $ 26,437,000 | 126,521,000 | 103,096,000 | 142,112,000
Deferred revenues |  | 209,314,000 |  |  |  | 213,145,000 |  |  |  | 209,314,000 | 213,145,000 |
Contract asset impairment |  |  |  |  |  |  |  |  |  | 0 | 0 |
Contract with customer, liability, revenue recognized |  |  |  |  |  |  |  |  |  | 203,682,000 | 202,354,000 |
Contract with customer liability additions |  |  |  |  |  |  |  |  |  | 193,999,000 | 202,806,000 |
Total revenues |  | 219,567,000 | $ 202,997,000 | $ 184,290,000 | $ 194,690,000 | 202,922,000 | $ 186,588,000 | $ 169,605,000 | $ 177,539,000 | $ 801,544,000 | $ 736,654,000 | $ 691,710,000
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2014-09, Topic 606 |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes | $ 125,464,000 |  |  |  |  |  |  |  |  |  |  |
Net income | 101,489,000 |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2014-09, Topic 340-40 |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes | 7,734,000 |  |  |  |  |  |  |  |  |  |  |
Net income | $ 6,333,000 |  |  |  |  |  |  |  |  |  |  |
Customer Concentration Risk | Revenue Benchmark | Channel Partners |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  |  | 8.00% | 8.00% | 9.00%
Portfolio Balancing |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenues |  | 18,166,000 |  |  |  | 18,060,000 |  |  |  | $ 18,166,000 | $ 18,060,000 |
Licenses |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | 338,792,000 |  |  |  | 311,689,000 |  |  |  |  |  |
Term Licenses |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | $ 281,410,000 |  |  |  | $ 251,996,000 |  |  |  |  |  |

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