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Stockholders’ Equity - Narrative (Details) - USD ($)			3 Months Ended
	Sep. 30, 2019	Jun. 07, 2019	Sep. 30, 2019	Jun. 30, 2019
Employee Stock Purchase Plan | Employee Stock Option
Class of Stock [Line Items]
Number of exercisable options				1,300,000
Minimum annual contributions per employee, percent				1.00%
Maximum annual contributions per employee, percent				10.00%
Maximum annual contributions per employee, amount				$ 25,000
Discount from market price				15.00%
Shares issued under employee stock purchase plan (in shares)	12,638
Price per share (in dollars per share)	$ 66.26		$ 66.26
Compensation costs			$ 100,000
Tax benefit recognized on compensation costs			$ 0
Subordinated Debt | 7.375% Subordinated Debentures due February 27, 2054
Class of Stock [Line Items]
Long-term debt, gross		$ 150,000,000.0
Stated interest rate		7.375%
Private Placement
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)		1,552,500
Sale of stock, price per share (in dollars per share)		$ 83.00
Gross proceeds from issuance of common stock		$ 128,900,000
Transaction costs		1,700,000
Net proceeds from issuance of common stock		127,200,000
Accrued Liabilities and Other Liabilities | Private Placement
Class of Stock [Line Items]
Transaction costs		$ 200,000

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