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Accounting Policies and Basis of Presentation Accounting Policies and Basis of Presentation (Recently Adopted Accounting Standards) (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2018 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) basis_points | Sep. 30, 2017 USD ($) | Oct. 23, 2018 shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Income taxes |  | $ 16,198 | $ 36,585 | $ 76,844 | $ 151,242 |
Effective income tax rate reconciliation, percent |  | 12.10% | 35.30% | 19.80% | 36.00% |
Tax cuts and jobs act of 2017, measurement period adjustment, income tax expense (benefit) |  | $ (15,700) |  |  |  |
Merchant processing |  |  | $ 20,400 |  | $ 60,400 |
Cardholder processing |  |  | 7,700 |  | 20,300 |
Cardholder reward programs |  |  | $ 1,300 |  | $ 6,800 |
Cumulative effect adjustments |  |  |  | $ (50,052) |  |
Income tax ASU cumulative effect adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  | 31,300 |  | 31,300 |  |
Financial Instruments ASU cumulative effect adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  | $ 18,700 |  | 18,700 |  |
Minimum |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect adjustments |  |  |  | 65,000 |  |
Maximum |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect adjustments |  |  |  | $ 85,000 |  |
Capital basis points | Minimum |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Capital Quantification | basis_points |  |  |  | 4 |  |
Capital basis points | Maximum |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Capital Quantification | basis_points |  |  |  | 6 |  |
Class A Common Stock |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stock repurchased during period (in shares) | shares |  | 125,000 |  |  |  |
Stock repurchased during period |  | $ 58,100 |  | $ 58,086 |  |
Stock repurchased during period (in USD per share) | $ / shares |  | $ 464.68 |  |  |  |
Class A Common Stock | Subsequent Event |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stock repurchased during period (in shares) | shares | 75,000 |  |  |  |  |
Stock repurchased during period | $ 32,900 |  |  |  |  |
Stock repurchased during period (in USD per share) | $ / shares | $ 438.26 |  |  |  |  |
Number of shares authorized to be repurchased (in shares) | shares |  |  |  |  |  | 800,000
Affiliated Entity | Class A Common Stock |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stock repurchased during period (in shares) | shares |  | 100,000 |  |  |  |

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