Debt instrument collateral carrying value.

No definition available.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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

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Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

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+ Details

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- Definition

Amount, after accumulated amortization, of debt premium.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

+ Details

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- Definition

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.

+ References

+ Details

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

+ Details

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- Details

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Debt Obligations (Schedule of Debt) (Details)	9 Months Ended
Debt Obligations (Schedule of Debt) (Details)	Sep. 30, 2017 USD ($) derivative_instrument	Jul. 31, 2017 USD ($)	Jul. 28, 2017 USD ($)	Dec. 31, 2016 USD ($) derivative_instrument	Jul. 25, 2016 USD ($)
Debt obligations under various arrangements with financial institutions
Long-term debt	$ 5,744,389,000
Net unamortized premium	2,838,000
Net unamortized debt issuance cost	(33,539,000)
Total debt obligations	5,713,688,000			$ 5,838,889,000
Collateral carrying value	$ 1,800,000,000
Interest Rate Swaps \| Designated as Hedging Instrument
Debt obligations under various arrangements with financial institutions
Number of instruments \| derivative_instrument	9			9
Notional amount	$ 1,400,000,000			$ 1,400,000,000
Term Loan \| Interest Rate Swaps \| Designated as Hedging Instrument
Debt obligations under various arrangements with financial institutions
Number of instruments \| derivative_instrument	1
Term Loan \| Unsecured $600M Term Loan \| 200.0 Million Interest Rate Swaps [Member]
Debt obligations under various arrangements with financial institutions
Effective percentage	0.82%
Term Loan \| Unsecured $600M Term Loan \| 200.0 Million Interest Rate Swaps [Member] \| Designated as Hedging Instrument
Debt obligations under various arrangements with financial institutions
Number of instruments \| derivative_instrument	2
Term Loan \| Unsecured $600M Term Loan \| 400.0 Million Interest Rate Swaps [Member]
Debt obligations under various arrangements with financial institutions
Effective percentage	0.88%
Stated spread rate	1.40%
Term Loan \| Unsecured $600M Term Loan \| 400.0 Million Interest Rate Swaps [Member] \| Designated as Hedging Instrument
Debt obligations under various arrangements with financial institutions
Number of instruments \| derivative_instrument	3
Term Loan \| Unsecured $300M Term Loan
Debt obligations under various arrangements with financial institutions
Effective percentage	0.82%
Stated spread rate	1.90%
Notional amount	$ 90,000,000
Term Loan \| Unsecured $300M Term Loan \| Interest Rate Swaps \| Designated as Hedging Instrument
Debt obligations under various arrangements with financial institutions
Number of instruments \| derivative_instrument	1
Term Loan \| Term Loan, Expires 07/31/2021 \| Interest Rate Swaps \| Designated as Hedging Instrument
Debt obligations under various arrangements with financial institutions
Number of instruments \| derivative_instrument	3
Secured loans
Debt obligations under various arrangements with financial institutions
Long-term debt	$ 915,936,000			1,312,292,000
Net unamortized premium	16,803,000			25,189,000
Net unamortized debt issuance cost	(150,000)			(387,000)
Long-term Debt	$ 932,589,000			1,337,094,000
Weighted average fixed interest rate	6.16%
Secured loans \| Minimum
Debt obligations under various arrangements with financial institutions
Stated percentage	4.40%
Secured loans \| Maximum
Debt obligations under various arrangements with financial institutions
Stated percentage	7.89%
Unsecured debt
Debt obligations under various arrangements with financial institutions
Long-term debt	$ 3,218,453,000			2,318,453,000
Net unamortized debt issuance cost	(23,306,000)			(17,402,000)
Net unamortized discount	(13,965,000)			(9,097,000)
Long-term Debt	$ 3,181,182,000			2,291,954,000
Weighted average fixed interest rate	3.81%
Unsecured debt \| Minimum
Debt obligations under various arrangements with financial institutions
Stated percentage	3.25%
Unsecured debt \| Maximum
Debt obligations under various arrangements with financial institutions
Stated percentage	7.97%
Unsecured debt \| Unsecured Credit Facility
Debt obligations under various arrangements with financial institutions
Long-term debt	$ 710,000,000			1,622,000,000
Stated percentage	2.60%
Unsecured debt \| Term Loan
Debt obligations under various arrangements with financial institutions
Term loan face amount	$ 210,000,000
Effective percentage	0.82%
Stated spread rate	1.35%
Unsecured debt \| Term Loan \| Unsecured $600M Term Loan
Debt obligations under various arrangements with financial institutions
Long-term debt	$ 600,000,000			600,000,000
Stated percentage	2.65%
Term loan face amount	$ 600,000,000
Unsecured debt \| Term Loan \| Unsecured $600M Term Loan \| 200.0 Million Interest Rate Swaps [Member]
Debt obligations under various arrangements with financial institutions
Notional amount	200,000,000
Unsecured debt \| Term Loan \| Unsecured $600M Term Loan \| 400.0 Million Interest Rate Swaps [Member]
Debt obligations under various arrangements with financial institutions
Notional amount	400,000,000
Unsecured debt \| Term Loan \| Unsecured $300M Term Loan
Debt obligations under various arrangements with financial institutions
Long-term debt	$ 300,000,000			0
Stated percentage	3.13722%
Term loan face amount		$ 300,000,000.0	$ 300,000,000
Unsecured debt \| Term Loan \| Term Loan, Expires 07/31/2021
Debt obligations under various arrangements with financial institutions
Term loan face amount	$ 500,000,000.0
Effective percentage	1.11%
Stated spread rate	1.35%
Unsecured debt \| Total Unsecured Credit Facility and Term Loan
Debt obligations under various arrangements with financial institutions
Net unamortized debt issuance cost	$ (10,083,000)			(12,159,000)
Long-term Debt	$ 1,599,917,000			$ 2,209,841,000
Unsecured debt \| Revolving Credit Facility
Debt obligations under various arrangements with financial institutions
Credit facility maximum borrowing capacity					$ 2,750,000,000.00