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Equity method investment - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Technology, trade name and customer relationship intangibles | $ 51,353,000 |  | $ 51,353,000 |  | $ 56,710,000
Amortization of Intangible Assets | 2,659,000 | $ 1,472,000 | 5,357,000 | $ 2,668,000 |
Dividends received from equity method investment |  |  | 23,433,000 | 14,917,000 |
Bankers Healthcare Group, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Technology, trade name and customer relationship intangibles | 12,000,000 |  | 12,000,000 |  | $ 13,400,000
Amortization of Intangible Assets | 693,000 | 832,000 | 1,400,000 | 1,700,000 |
Accretion income | 729,000 | 767,000 | 1,500,000 | 1,600,000 |
Dividends received from equity method investment | 19,100,000 | 12,500,000 | 23,433,000 | 14,917,000 |
Loan face amount | $ 0 | $ 0 | $ 0 | $ 0 |

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