Recent Accounting Pronouncements Adopted ASUs (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 15,503	$ 21,400	$ 0
Operating lease liabilities	16,797	23,900
Long-term imputed financing obligation	0	37,600	36,297
Capitalized building property		32,000
Accumulated deficit	$ 280,712	$ (4,500)	$ 204,294