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Equity method investment - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Technology, trade name and customer relationship intangibles | $ 48,737,000 |  | $ 48,737,000 |  | $ 56,710,000
Amortization of Intangible Assets | 2,616,000 | $ 3,077,000 | 7,973,000 | $ 5,745,000 |
Dividends received from equity method investment |  |  | 33,651,000 | 19,372,000 |
Bankers Healthcare Group, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Technology, trade name and customer relationship intangibles | 11,300,000 |  | 11,300,000 |  | $ 13,400,000
Amortization of Intangible Assets | 693,000 | 832,000 | 2,100,000 | 2,500,000 |
Accretion income | 719,000 | 758,000 | 2,200,000 | 2,300,000 |
Dividends received from equity method investment | 10,200,000 | 4,500,000 | 33,700,000 | 19,400,000 |
Loan face amount | $ 0 | $ 0 | $ 0 | $ 0 |

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