Schedule I - Financial Information of the Registrant (Parent Company) - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 192,067	$ 150,079	$ 185,772	$ 179,067
Receivables:
Notes - due from subsidiaries	2,987	3,203
Allowance for uncollectible amounts	(4,614)	(5,156)
Total receivables	71,462	78,516
Property and equipment, at cost:
Furniture and equipment	216,498	226,461
Accumulated depreciation	(182,663)	(186,279)
Total property and equipment, at cost	60,794	67,022
Title plant, at cost	74,737	74,237
Investments in subsidiaries, on an equity-method basis	8,590	9,202
Goodwill	248,890	231,428	217,094
Other assets	43,121	47,664
Total assets	1,372,930	1,405,886
Liabilities
Accounts payable and other liabilities	109,283	117,740
Total Liabilities	693,093	727,076
Contingent liabilities and commitments
Stockholders’ equity
Common Stock – $1 par, authorized 50,000,000; issued 24,071,508 and 24,071,683; outstanding 23,719,347 and 23,719,522, respectively	24,072	24,072
Additional paid-in capital	162,642	159,954
Retained earnings	514,248	491,698
Accumulated other comprehensive (loss) income (AOCI):
Foreign currency translation adjustments	(19,505)	(8,373)
Treasury stock – 352,161 common shares, at cost	(2,666)	(2,666)
Total stockholders’ equity	679,837	678,810	648,848	637,128
Total liabilities and stockholders' equity	1,372,930	1,405,886
Parent Company
Assets
Cash and cash equivalents	24,823	11,622	2,890	832
Receivables:
Notes - due from subsidiaries	6,609	26,316
Receivables from affiliates	7	930
Allowance for uncollectible amounts	0	(1)
Total receivables	6,616	27,245
Property and equipment, at cost:
Furniture and equipment	2,662	2,733
Accumulated depreciation	(2,449)	(2,517)
Total property and equipment, at cost	213	216
Title plant, at cost	48	48
Investments in subsidiaries, on an equity-method basis	737,273	731,975
Goodwill	8,470	8,470
Other assets	17,421	18,274
Total assets	794,864	797,850
Liabilities
Notes payable	98,875	98,875
Accounts payable and other liabilities	22,464	26,764
Total Liabilities	121,339	125,639
Contingent liabilities and commitments	0	0
Stockholders’ equity
Common Stock – $1 par, authorized 50,000,000; issued 24,071,508 and 24,071,683; outstanding 23,719,347 and 23,719,522, respectively	24,072	24,072
Additional paid-in capital	162,642	159,954
Retained earnings	514,248	491,698	$ 471,788	$ 455,519
Accumulated other comprehensive (loss) income (AOCI):
Foreign currency translation adjustments	(19,505)	(8,373)
Unrealized investment gains	(5,266)	7,526
Treasury stock – 352,161 common shares, at cost	(2,666)	(2,666)
Total stockholders’ equity	673,525	672,211
Total liabilities and stockholders' equity	$ 794,864	$ 797,850