Recent Accounting Standards Accounting Standard Adopted (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Jan. 01, 2018	Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement, Early Adoption [Table Text Block]	0.9
Cumulative effect adjustment of adopting ASU 2014-09		$ 400	$ (396)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment of adopting ASU 2014-09			$ (396)