Debt Instrument, Covenant Terms, Debt to Equity Ratio, Maximum

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- Definition

Debt Instrument, Covenant Terms, Debt to Equity Ratio, Maximum, Excluding Subsidiary Debt

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- Definition

Extinguishment Of Debt, Stated Interest Rate

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- Definition

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

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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

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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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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- Definition

Weighted average interest rate of short-term debt outstanding calculated at point in time.

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Debt (Narrative) (Details) $ in Thousands	1 Months Ended				12 Months Ended
Debt (Narrative) (Details) $ in Thousands	Jun. 30, 2018 USD ($)	May 31, 2018 USD ($)	Nov. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Apr. 30, 2018 USD ($)
Debt Instrument [Line Items]
Loss on debt extinguishment					$ 0	$ 0	$ 118
Senior Unsecured Debt
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs					$ 20,369	$ 19,821
6.80% Medium-term notes due 2018 \| Senior Unsecured Debt
Debt Instrument [Line Items]
Stated interest rate						6.80%
6.80% Medium-term notes due 2018 \| Medium-term Notes
Debt Instrument [Line Items]
Extinguishment of debt, amount	$ 877,500
Extinguishment of debt, stated interest rate	6.80%
2.70% Medium-term notes due in 2017 \| Medium-term Notes
Debt Instrument [Line Items]
Extinguishment of debt, amount				$ 400,000
Extinguishment of debt, stated interest rate				2.70%
1.55% Medium-term notes due in 2017 \| Medium-term Notes
Debt Instrument [Line Items]
Extinguishment of debt, amount			$ 400,000
Extinguishment of debt, stated interest rate			1.55%
Line of Credit \| Credit Facility Maturing April 2023, Five Year Maturity [Member]
Debt Instrument [Line Items]
Debt instrument, term					5 years
Line of credit, maximum borrowing capacity								$ 780,000
Line of Credit \| Global Credit Facilities
Debt Instrument [Line Items]
Covenant, debt to equity ratio					10.0
Covenant, debt to equity ratio, excluding subsidiary debt					0.7
Line of Credit \| Credit Facility Maturing April 2021, 5 Year Term
Debt Instrument [Line Items]
Debt instrument, term					5 years
Line of credit, maximum borrowing capacity					$ 765,000
Line of Credit \| Credit Facility Maturing April 2019, 5 Year Term
Debt Instrument [Line Items]
Debt instrument, term					5 years
Line of credit, maximum borrowing capacity					$ 675,000
Line of Credit \| Credit Facility Maturing April 2018, 364 Day Term [Member]
Debt Instrument [Line Items]
Debt instrument, term					364 days
Line of credit, maximum borrowing capacity					$ 100,000
Line of Credit \| Credit Facility Maturing May 2018, 364 Day Term [Member]
Debt Instrument [Line Items]
Debt instrument, term		364 days
Line of credit, maximum borrowing capacity		$ 25,000
Unsecured Commercial Paper
Debt Instrument [Line Items]
Debt instrument, term					365 days
Weighted-average interest rate of commercial paper					2.79%	1.48%