Stockholders' Equity Note Disclosure [Text Block] (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Aug. 31, 2016
Treasury Stock, Shares, Acquired	135,311	2,289,502
Treasury Stock, Value, Acquired, Cost Method	$ 4,019	$ 46,527
TREASURY STOCK, AT COST
Treasury Stock, Shares, Acquired	135,311	2,289,502
Treasury Stock, Value, Acquired, Cost Method	$ 4,019	$ 46,527
Stock Issued During Period, Shares, Share-based Compensation, Gross	123,274	72,312
Private Placement Member
Treasury Stock, Shares, Acquired		703,000
Treasury Stock, Value, Acquired, Cost Method		$ 13,975
Tender Offer
Treasury Stock, Shares, Acquired		1,385,118
Treasury Stock, Value, Acquired, Cost Method		$ 27,702
IhcShareRepurchaseProgramMember
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			3,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	1,855,747