Stockholders’ Equity - Narrative (Details) - USD ($)		3 Months Ended
	Jun. 07, 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%
Subordinated Debt | 7.375% Subordinated Debentures due February 27, 2054
Class of Stock [Line Items]
Long-term debt	$ 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	$ 300,000