Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Incremental percentage increase (decrease) in the stated rate on a debt instrument.

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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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Fair value amount of debt instrument that was repurchased.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Debt (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Debt (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Aug. 02, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Loss on extinguishment of debt			$ 7,964	$ 0
Principal amount	$ 3,301,177		$ 3,301,177			$ 3,866,317
Notes due \| Notes due May 2022
Debt Instrument [Line Items]
Increase in interest rate		0.25%
Interest rate	4.375%		4.375%
Principal amount	$ 400,000		$ 400,000			400,000
Notes due \| Notes due September 2020
Debt Instrument [Line Items]
Increase in interest rate		0.25%
Interest rate	3.875%		3.875%
Principal amount	$ 300,000		$ 300,000			300,000
Notes due \| Notes due October 2021
Debt Instrument [Line Items]
Increase in interest rate		0.25%
Interest rate	3.625%		3.625%
Principal amount	$ 600,000		$ 600,000			600,000
Notes due \| Notes due April 2023
Debt Instrument [Line Items]
Increase in interest rate		0.25%
Interest rate	4.70%		4.70%
Principal amount	$ 400,000		$ 400,000			400,000
Notes due \| Notes due 2019
Debt Instrument [Line Items]
Debt redeemed					$ 300,000
Loss on extinguishment of debt	$ 8,000
Interest rate	6.25%		6.25%
Principal amount	$ 0		$ 0			300,000
Notes due \| Notes due March 2018
Debt Instrument [Line Items]
Repayments of debt			$ 250,000
Interest rate	5.60%		5.60%
Principal amount	$ 0		$ 0			250,000
Term loans
Debt Instrument [Line Items]
Repayments of debt			15,000
Principal amount	635,000		635,000			$ 650,000
Term loans \| Notes due 2019
Debt Instrument [Line Items]
Principal amount	$ 150,000		$ 150,000