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

Number of Variable Rate Unsecured Loans

+ 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
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-SubTopic 470
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
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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

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-Name Accounting Standards Codification
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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.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

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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
-Publisher FASB
-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) $ in Thousands	3 Months Ended		9 Months Ended
Indebtedness Unsecured Debt (Details) $ in Thousands	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) loans	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	5.95%		5.95%
Repayments of Unsecured Debt			$ 285,339	$ 759,948
Gains (Losses) on Extinguishment of Debt	$ (6,243)	$ 64	$ (8,673)	(82,589)
Number of Variable Rate Unsecured Loans \| loans			1
Proceeds from Issuance of Unsecured Debt			$ 375,000	$ 0
Long-term Debt	$ 2,991,051		$ 2,991,051		$ 3,320,141
Debt Instrument, Interest Rate, Effective Percentage	3.36%		3.36%
Debt Instrument, Repurchased Face Amount	$ 203,000		$ 203,000
Debt Instrument, Interest Rate, Stated Percentage	3.25%		3.25%
Variable Rate UnSecured Debt [Member] [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 250,000		$ 250,000
Debt Instrument, Interest Rate, Effective Percentage	1.68%		1.68%
Fixed Rate Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum			103.00%
Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum			137.00%
Debt Instrument, Covenant Compliance			We were in compliance with all such covenants at September 30, 2016
Unsecured Debt [Member]
Debt Instrument [Line Items]
Repayments of Unsecured Debt			$ 209,000
Proceeds from Issuance of Unsecured Debt			375,000
Long-term Debt	$ 2,628,980		2,628,980		$ 2,530,743
Tender Offer [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 72,000		72,000
Tender Offer [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Repayments of Unsecured Debt			$ 74,500