Supplemental Consolidated Financial Statement Information - Deferred Costs and Deferred Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019	Jan. 01, 2018
Supplemental Consolidated Financial Statement Information
Deferred Costs	$ 2,525	$ 6,994	$ 6,994	$ 2,991
Total deferred costs amortized	38,468	36,615
Deferred revenue	3,481	10,501	$ 10,501	$ 6,314
Revenue recognized that was included in deferred revenue balances at beginning of period	$ 10,501	$ 5,945