Subsequent Events (Details) - Line of Credit - USD ($)	Jul. 31, 2018	Jun. 30, 2018	Aug. 05, 2015
Term Loan
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity		$ 135,000,000
Revolving line of credit
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity			$ 50,000,000
Fourth Amendment To Credit Agreement | Subsequent Event
Subsequent Event [Line Items]
Interest expense, borrowings	$ 2,100,000
Debt issuance costs	900,000
Fourth Amendment To Credit Agreement | Term Loan | Subsequent Event
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	60,000,000.0
Fourth Amendment To Credit Agreement | Revolving line of credit | Subsequent Event
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	$ 100,000,000.0