Commitments and Contingencies Disclosure [Text Block] (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leases, Rent Expense, Net		$ 2,117	$ 2,316	$ 3,088
Pending Litigation | Loss Contingency, Nature, Injunctive Relief and Damages Member
Loss Contingency, Damages Sought, Value	$ 50,000
Pending Litigation | Loss Contingency, Nature, Amounts Allegedly Owed To Plaintiff Member
Loss Contingency, Damages Sought, Value	$ 3,082