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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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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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- Definition

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

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- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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- Definition

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

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- Definition

The average effective interest rate during the reporting period.

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- Definition

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, after accumulated amortization, of debt discount.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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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.

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Debt Obligations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 18, 2019	Dec. 31, 2018	Oct. 17, 2018	Oct. 30, 2014
Debt Instrument [Line Items]
Debt Instrument, Convertible, Conversion Price	$ 147.24			$ 147.24
Repayments of Other Long-term Debt				$ 446,702	$ 6,199
Debt Instrument, Redemption Price, Percentage	100.00%
Unamortized Debt Issuance Expense	$ 21,318			21,318			$ 6,298
Total Debt [Roll Forward]
Revolving Credit Facility	6,129			6,129			215,725
Other Debt	$ 24,279			$ 24,279			38,513
Line of Credit Facility, Expiration Date	Oct. 17, 2023
Repayments of Convertible Debt	$ 352,400	$ 94,200
1.5% Issue [Member]
Debt Instrument [Line Items]
Debt Instrument, Convertible, Conversion Price									$ 72.18
Debt Instrument, Interest Rate, Stated Percentage	1.50%			1.50%
Total Debt [Roll Forward]
Convertible Debt	$ 0			$ 0			$ 379,859
Interest Expense, Debt				1,500
Amortization of Debt Discount (Premium)	1,800		$ 4,600
0.75% Issue [Member]
Debt Instrument [Line Items]
Debt Instrument, Convertible, Conversion Price						$ 188.73
Debt Instrument, Convertible, Carrying Amount of Equity Component						$ 99,700
Total Debt [Roll Forward]
Convertible Debt	429,563			429,563
Interest Expense, Debt	1,000			1,100
Amortization of Debt Discount (Premium)	$ 3,600			$ 4,200
Debt Instrument, Interest Rate During Period	4.40%			4.40%
Debt Instrument, Unamortized Discount	$ 95,400			$ 95,400
Unsecured Debt [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity								$ 1,000,000
Base Rate [Member] \| Minimum [Member]
Total Debt [Roll Forward]
Debt Instrument, Basis Spread on Variable Rate	0.175%
Base Rate [Member] \| Maximum [Member]
Total Debt [Roll Forward]
Debt Instrument, Basis Spread on Variable Rate	1.00%
London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Total Debt [Roll Forward]
Debt Instrument, Basis Spread on Variable Rate	1.125%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Total Debt [Roll Forward]
Debt Instrument, Basis Spread on Variable Rate	2.00%