Debt (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal amount	$ 3,606,219	$ 3,606,219	$ 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	3.625%	3.625%
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 March 2018
Debt Instrument [Line Items]
Repayments of debt		$ 250,000
Interest rate	5.60%	5.60%
Principal amount	$ 0	$ 0	250,000
Notes due \| Notes due March 2019
Debt Instrument [Line Items]
Interest rate	6.25%	6.25%
Principal amount	$ 300,000	$ 300,000	300,000
Term loans
Debt Instrument [Line Items]
Repayments of debt		10,000
Principal amount	$ 640,000	$ 640,000	$ 650,000

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: 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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

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

+ References

No definition available.

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- Definition

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

+ 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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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