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Debt (Detail Textuals) - USD ($) $ in Thousands	6 Months Ended
Debt (Detail Textuals) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Jul. 31, 2017
Debt Instrument [Line Items]
Revolving credit facility	$ 88,000	$ 70,000
Interest rate swap
Debt Instrument [Line Items]
Percentage of interest rate	1.8325%	1.8325%		1.8325%
Derivative, notional amount	$ 150,000	$ 150,000		$ 150,000
Credit agreement (the "Credit Agreement") \| Revolving credit facility (the "Revolver")
Debt Instrument [Line Items]
Maximum borrowing capacity	250,000
Revolving credit facility	88,000
Outstanding letters of credit	4,191
Aggregate available credit facilities	$ 157,809
Weighted-average interest rates	3.71%		3.01%
Percentage of interest rate	4.00%
Credit agreement (the "Credit Agreement") \| Term A Loan and together with the Revolver, "Credit Facilities"
Debt Instrument [Line Items]
Maturity dates	June 29, 2022
Covenant requirement, permitted leverage ratio	a minimum consolidated interest coverage ratio, each calculated on a trailing four quarter basis
Credit agreement (the "Credit Agreement") \| Term A Loan and together with the Revolver, "Credit Facilities" \| LIBOR
Debt Instrument [Line Items]
Interest rate, description	2.00%, 1.75% or 1.50
Floor rate	0.00%
Credit agreement (the "Credit Agreement") \| Term A Loan and together with the Revolver, "Credit Facilities" \| Eurodollar
Debt Instrument [Line Items]
Interest rate, description	2.00%, 1.75% or 1.50
Credit agreement (the "Credit Agreement") \| Term A Loan and together with the Revolver, "Credit Facilities" \| Base Rate
Debt Instrument [Line Items]
Interest rate, description	1.00%, 0.75% or 0.50
Credit agreement (the "Credit Agreement") \| Term A Loan
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 250,000
Weighted-average interest rates	3.47%		3.29%
Percentage of interest rate	3.58%