Segment Information - Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Segments Information
Assets	$ 2,378,479	$ 1,563,765
Operating Segments
Segments Information
Assets	2,022,911	1,387,939
Corporate, Non-Segment
Segments Information
Assets	355,568	175,826
Consumer services and plans | Operating Segments
Segments Information
Assets	122,273	152,689
Retail | Operating Segments
Segments Information
Assets	$ 1,900,638	$ 1,235,250