Significant Accounting Policies Update (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment per unit value minimum	$ 1,000		$ 1,000
Property and equipment useful life minimum			1 year
Loss from equity method investment	$ 1,388,000	$ 0	$ 1,388,000	$ 0
MUFG
Property, Plant and Equipment [Line Items]
Ownership percent	20.00%		20.00%
Equity method investment	$ 36,000,000.0		$ 36,000,000.0
Loss from equity method investment	1,400,000
Network assets
Property, Plant and Equipment [Line Items]
Useful life			5 years		4 years
Decrease to deprecation expense	7,800,000		$ 24,500,000
Increase to net income	$ 6,400,000		$ 20,300,000
Increase to net income (in dollars per share)	$ 0.04		$ 0.12