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Tax Effects of Temporary Differences That Give Rise to Significant Portions of Net Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Deferred tax assets:    
Discounted unpaid losses and loss adjustment expenses $ 8,351 $ 7,492
Unearned premiums 8,061 3,409
Alternative minimum tax credit carryover 10,473 10,473
Partnership K1 basis differences 145 145
Capital gain on derivative instruments 4,130 4,786
Investment impairments 1,097 379
Stock options 2,306 2,048
Deferred acquisition costs 1,606 187
Stat-to-GAAP reinsurance reserve 1,424 1,424
Intercompany transfers 1,807 1,919
Other 4,082 3,050
Total deferred tax assets 43,482 35,312
Deferred tax liabilities:    
Intangible assets 6,218 3,220
Unrealized gain on securities available-for-sale and investments in limited partnerships included in accumulated other comprehensive income 8,390 10,263
Investment basis differences 979 692
Depreciation and amortization 129 16
Other 882 871
Total deferred tax liabilities 16,598 15,062
Total net deferred tax assets $ 26,884 $ 20,250