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Borrowings (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) D $ / shares	Dec. 31, 2020 USD ($)	Jul. 01, 2021 USD ($)	Jun. 30, 2021 USD ($)	Feb. 28, 2017 USD ($)
Borrowings
Borrowings outstanding	$ 81,622	$ 81,622		$ 81,622
Increase to retained earnings	606,647	606,647		606,647			$ 548,842
Reduction in common stock	30,909	30,909		30,909			105,724
Revolving Credit Facility
Borrowings
Maximum borrowing capacity	600,000	600,000		600,000
Credit facility under term loan	150,000			$ 150,000
Unused commitment fee (as a percent)				0.10%
Borrowings outstanding	81,600	81,600		$ 81,600
Available credit facility	434,200	434,200		434,200
Revolving Credit Facility | Minimum
Borrowings
Maximum borrowing capacity	535,000	535,000		$ 535,000
Unused commitment fee (as a percent)				0.10%
Revolving Credit Facility | Maximum
Borrowings
Maximum borrowing capacity	750,000	750,000		$ 750,000
Increase in the credit agreement's borrowing capacity available under certain circumstances	250,000	250,000		$ 250,000
Unused commitment fee (as a percent)				0.25%
Revolving Credit Facility | LIBOR
Borrowings
Interest rate margin (as a percent)				1.00%
Revolving Credit Facility | LIBOR | Minimum
Borrowings
Interest rate margin (as a percent)				1.00%
Revolving Credit Facility | LIBOR | Maximum
Borrowings
Interest rate margin (as a percent)				1.75%
Letters of credit sub facility
Borrowings
Maximum borrowing capacity	300,000	300,000		$ 300,000
Amount outstanding under letters of credit	84,200	84,200		84,200
1.25% Convertible Senior Notes Due 2022
Borrowings
Principal amount	$ 287,500	$ 287,500		$ 287,500				$ 287,500
Interest rate (as a percentage)	1.25%	1.25%		1.25%
Conversion ratio				9.3056
Conversion price | $ / shares	$ 107.46	$ 107.46		$ 107.46
Premium on stock price	38.50%	38.50%		38.50%
Threshold percentage of stock price				130.00%
Number of trading days | D				20
Number of consecutive trading days | D				30
Principal amount of the notes to be repurchased (as a percentage)				100.00%
Liability component of convertible debt	$ 242,400	$ 242,400		$ 242,400
Equity component of convertible debt	45,100	45,100		45,100
Debt issuance costs	7,700	7,700		7,700
Debt Component of debt issuance costs	6,500	6,500		6,500
Equity component of debt issuance costs	1,200	1,200		1,200
Total interest expense		1,200	$ 3,300	2,500	$ 6,600
Contractual interest expense		900	900	1,800	1,800
Amortization of debt discount			2,100		4,200
Amortization of debt issuance costs		300	$ 300	700	$ 600
Unamortized discount							10,494
Unamortized debt issuance costs	900	900		900			$ 1,400
Bank lines of credit
Borrowings
Amount outstanding under letters of credit	59,600	59,600		59,600
Available credit facility	$ 15,500	$ 15,500		$ 15,500
ASU 2020-06 | Cumulative effect period of adoption, adjustment
Borrowings
Liability component of convertible debt						$ 10,000
Increase to retained earnings						19,000
Reduction in common stock						27,000
ASU 2020-06 | Cumulative effect period of adoption, adjustment | 1.25% Convertible Senior Notes Due 2022
Borrowings
Liability component of convertible debt						10,000
Increase to retained earnings						19,000
Reduction in common stock						$ 27,000

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The percentage of the premium over the stock price of the conversion feature embedded in the debt instrument.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The price per share of the conversion feature embedded in the debt instrument.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage of principal amount of debt redeemed.

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Amount, after accumulated amortization, of debt discount.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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