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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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