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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Apr. 30, 2014
Deferred tax assets:      
Book over tax depreciation of property and equipment $ 37,383 $ 31,535 $ 28,868
Net operating loss carryforwards 36,187 40,357 36,594
Accrued expenses and reserves 31,611 28,929 30,690
Alternative minimum tax credit carryforwards 3,766 3,457 3,330
General business tax credit carryforwards 3,379 2,921 2,666
Stock awards 1,338 1,082 1,315
Unrealized loss on hedges and swaps 71 672 1,115
Capital loss carryforwards     2,510
Other 2,707 2,106 1,496
Total deferred tax assets 116,442 111,059 108,584
Less: valuation allowance (93,007) (87,121) (84,540)
Total deferred tax assets after valuation allowance 23,435 23,938 24,044
Deferred tax liabilities:      
Amortization of intangibles (28,935) (28,659) (28,210)
Other (95) (264) (286)
Total deferred tax liabilities (29,030) (28,923) (28,496)
Net deferred tax liability $ (5,595) $ (4,985) $ (4,452)