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Credit Losses - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Line Items]          
Equity   $ 362,632 $ 947,669 $ 974,271 $ 698,500
Provision for expected credit losses   $ 65,710 20,563 7,749  
ACH Payment | Customer Concentration Risk | Commercial Air Travel          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Concentration risk percentage   52.00%      
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Commercial Air Travel          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Concentration risk percentage   63.00%      
Retained Earnings (Deficit)          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Equity   $ (2,090,022) (763,482) $ (768,566) (1,053,446)
Accounting Standards Update 2016-13          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Increase in allowance for credit loss $ 10,000        
Decrease in deferred tax liabilities 1,000        
Increase in accounts receivable 1,000        
Adjustment          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Equity     $ (7,593)   101,429
Adjustment | Retained Earnings (Deficit)          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Equity         $ 101,429
Adjustment | Accounting Standards Update 2016-13 | Retained Earnings (Deficit)          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Equity $ 8,000