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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Deferred revenue and cancellation reserves $ 39,397 $ 49,332
Allowances and accruals, including state NOL carryforward amounts 36,314 49,074
Credits and other 1,112 1,781
Valuation allowance (557) (227)
Total deferred tax assets 76,266 99,960
Deferred tax liabilities:    
Inventories (20,926) (22,253)
Goodwill (35,042) (41,107)
Property and equipment, principally due to differences in depreciation (73,399) (93,943)
Prepaid expenses and other (3,176) (1,732)
Total deferred tax liabilities (132,543) (159,035)
Total $ (56,277) $ (59,075)