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Deferred Tax Liability (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Contract and service revenues and costs | $ 54,908 | $ 69,597
Expense reserves (bad debts, insurance, franchise tax and vacation) | 14,648 | 14,770
Net operating loss carryforwards | 3,547 | 3,543
Other, net | 2,119 | 2,090
Total gross deferred tax assets | 75,222 | 90,000
Valuation allowance | (357) | (608)
Net deferred tax assets | 74,865 | 89,392
Accelerated tax depreciation | (36,994) | (40,857)
Accelerated tax amortization | (178,999) | (160,719)
Contract and service revenues and costs | (78,413) | (76,417)
Total gross deferred liabilities | 294,406 | 277,993
Net deferred tax liability | $ (219,541) | $ (188,601)

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