CONSOLIDATED CONDENSED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Benefits and settlement expenses, reinsurance ceded	$ 295,777	$ 284,405	$ 641,603	$ 545,805
Other operating expenses, reinsurance ceded	$ 52,558	$ 54,132	$ 96,627	$ 105,893