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Basis of Presentation - Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Fair Value of Financial Instruments
Liabilities - contingent payment obligations	$ 14,721	$ 11,840
Recurring
Fair Value of Financial Instruments
Equity securities	284	254
Insurance company contracts	30,941	26,940
Interest rate swap agreement	21	20
Total assets	31,246	27,214
Liabilities - contingent payment obligations	14,721	11,840
Recurring | Level 1
Fair Value of Financial Instruments
Equity securities	284	254
Total assets	284	254
Recurring | Level 2
Fair Value of Financial Instruments
Insurance company contracts	30,941	26,940
Interest rate swap agreement	21	20
Total assets	30,962	26,960
Recurring | Level 3
Fair Value of Financial Instruments
Total assets	0
Liabilities - contingent payment obligations	$ 14,721	$ 11,840

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