Acquisitions (Summary Of Fair Value Of Assets Acquired And Liabilities Assumed) (Details) - State National Companies, Inc. [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Nov. 17, 2017
ASSETS
Investments		$ 395,940
Cash and cash equivalents		77,302
Restricted cash and cash equivalents		25,545
Receivables		147,256
Prepaid reinsurance premiums		808,331
Reinsurance recoverables on paid and unpaid losses		2,075,734
Other assets		83,721
LIABILITIES
Unpaid losses and loss adjustment expenses		2,086,621
Unearned premiums		825,529
Payables to insurance and reinsurance companies		122,203
Senior long-term debt and other debt		44,500
Other liabilities		365,826
Net assets		169,150
Goodwill	$ 379,200	379,150
Intangible assets		370,500
Acquisition date fair value		$ 918,800