Note 18. Quarterly Data (unaudited): Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Details
TOTAL REVENUES	$ 125,080	$ 140,418	$ 133,105	$ 134,265	$ 127,090	$ 129,752	$ 136,019	$ 141,072	$ 532,868	$ 533,933	$ 575,044
Net income (loss)	5,147	14,888	5,156	5,331	4,212	4,824	3,880	4,005	30,522	16,921	15,256
(Income) loss from noncontrolling interests in subsidiaries	(214)	(128)	(124)	(112)	(178)	(114)	(32)	(304)	(578)	(628)	(1,477)
NET INCOME (LOSS) ATTRIBUTABLE TO IHC	$ 4,933	$ 14,760	$ 5,032	$ 5,219	$ 4,034	$ 4,710	$ 3,848	$ 3,701	$ 29,944	$ 16,293	$ 13,779
Basic income (loss) per common share	$ 0.29	$ 0.85	$ 0.29	$ 0.30	$ 0.23	$ 0.27	$ 0.22	$ 0.21	$ 1.73	$ 0.93	$ 0.78
Diluted income (loss) per common share	$ 0.28	$ 0.85	$ 0.29	$ 0.30	$ 0.23	$ 0.27	$ 0.22	$ 0.21	$ 1.71	$ 0.92	$ 0.77