Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum

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- Definition

Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

+ 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

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-Publisher FASB
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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.22(a)(1))
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- Definition

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

+ References

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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

No definition available.

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- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
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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
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- Definition

The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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Indebtedness Unsecured Debt (Details) - USD ($)	12 Months Ended
Indebtedness Unsecured Debt (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term Debt	$ 2,422,891,000	$ 2,908,477,000
Proceeds from unsecured debt	$ 300,000,000	$ 375,000,000	$ 0
Debt Instrument, Interest Rate, Stated Percentage	3.38%	3.25%
Loss on debt extinguishment	$ (26,104,000)	$ (33,934,000)	(85,713,000)
Repayments of Unsecured Debt	$ 692,137,000	$ 440,040,000	$ 913,143,000
Debt Instrument, Interest Rate, Effective Percentage	3.39%	3.36%
October Repurchase [Member]
Debt Instrument [Line Items]
Loss on debt extinguishment		$ 25,200,000
Repayments of Unsecured Debt		154,100,000
Debt Instrument, Repurchased Face Amount		$ 129,500,000
Tender Offer [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.95%
Loss on debt extinguishment		$ 8,800,000
Debt Instrument, Repurchased Face Amount		275,000,000
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis	LIBOR
Variable Rate UnSecured Debt [Member]
Debt Instrument [Line Items]
Loss on debt extinguishment	$ 523,000
Repayments of Unsecured Debt	$ 250,000,000
Variable Rate UnSecured Debt [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Fixed Rate Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum	99.00%
Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum	130.00%
Debt Instrument, Covenant Compliance	We were in compliance with all such financial covenants at
Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 2,132,042,000	2,498,835,000
Proceeds from unsecured debt	$ 300,000,000	375,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Loss on debt extinguishment	$ 9,000,000
Repayments of Unsecured Debt	$ 285,600,000
Debt Instrument, Interest Rate, Effective Percentage	6.08%
Unsecured Debt [Member] \| Tender Offer [Member]
Debt Instrument [Line Items]
Repayments of Unsecured Debt		$ 283,500,000
Fixed Rate Unsecured Debt Repaid [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.25%
Debt Instrument, Interest Rate, Effective Percentage		8.38%
Unsecured notes repaid in July [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.75%
Loss on debt extinguishment	$ 16,600,000
Repayments of Unsecured Debt	$ 128,700,000