Debt instrument, Unamortized discount, Percent of face amount.

No definition available.

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- Definition

Debt instrument, yield to maturity.

+ References

No definition available.

+ Details

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- Definition

Debt instrument, yield to maturity spread at time of pricing.

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Accordion Feature, Increase Limit

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant, Maximum Leverage Ratio

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant, Maximum Percent of Payments of Dividends and Distributions

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant, Maximum Secured Indebtedness to Asset Value Ratio.

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant, Maximum Unsecured Indebtedness to Unencumbered Asset Value Ratio

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant, Minimum Fixed Charge Coverage Ratio

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Covenant, Minimum Unencumbered Cash Flow to Interest Expense on Unsecured Debt Ratio

+ References

No definition available.

+ Details

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- Definition

Maximum credit spread on LIBOR based loans.

+ References

No definition available.

+ Details

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- Definition

Maximum Debt Instrument, Basis Spread on Variable Rate

+ References

No definition available.

+ Details

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- Definition

Minimum credit spread on LIBOR based loans.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Percentage of fund from operations.

+ References

No definition available.

+ Details

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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 of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ 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)
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-Publisher SEC
-Name Regulation S-X (SX)
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-Section 02
-Paragraph 20
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

+ Details

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

- Definition

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (g)
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

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Period Type:	duration

- Definition

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

+ References

+ Details

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Balance Type:	na
Period Type:	instant

- 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.

+ Details

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Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Description of debt redemption features under terms of the debt agreement.

+ References

+ Details

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Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ 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=6451184&loc=d3e28541-108399

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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
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-Name Accounting Standards Codification
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-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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Period Type:	duration

- 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
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-Paragraph 2
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-Name Accounting Standards Codification
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-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

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Balance Type:	credit
Period Type:	duration

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

- Definition

Weighted average interest rate of long-term debt outstanding.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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Balance Type:
Period Type:

- Details

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Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
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Balance Type:
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Debt Obligations (Textual) (Details) - USD ($)			12 Months Ended
Debt Obligations (Textual) (Details) - USD ($)	May. 12, 2015	Sep. 16, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	May. 15, 2015
Debt Instrument [Line Items]
Extinguishment of Debt, Amount			$ 0	$ 376,174,000	$ 29,250,000
Loss on early extinguishment of debt			0	(7,594,000)	(2,119,000)
Write off of Deferred Debt Issuance Cost				152,000	40,000
Recognized hedge activity			$ 0	$ (828,000)	$ 0
Financial and operating covenant description			The restriction on dividends permits the Company to pay dividends to the greater of (i) an amount required for the Company to retain its qualification as a REIT and (ii) 95% of its funds from operations. The term loan includes financial covenants that require the Company to maintain an interest coverage ratio, a fixed charge coverage ratio and an unencumbered cash flow ratio above specified levels; to maintain a minimum net worth above an amount determined on a specified formula; and to maintain a leverage ratio and a secured debt ratio below certain maximum levels.
Percentage of fund from operations			95.00%
New Credit Facility [Member] \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt term	4 years
Maximum borrowing capacity						$ 600,000,000
Increase in limit						400,000,000
Minimum Credit Spread on a LIBOR Rate Loan			0.00%
Maximum Credit Spread on a LIBOR Rate Loan			0.55%
Commitment fee percentage			0.25%
Minimum fixed charge coverage ratio			1.5
Maximum leverage ratio			0.60
Maximum unsecured indebtedness to unencumbered asset value ratio			0.60
Maximum secured indebtedness to total asset value ratio			0.40
Minimum unencumbered cash flow to interest expense on unsecured debt ratio			1.75
Maximum percent of payments of dividends and distributions			95.00%
New Credit Facility [Member] \| Revolving Credit Facility \| Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage			0.125%
New Credit Facility [Member] \| Revolving Credit Facility \| Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage			0.30%
New Credit Facility [Member] \| Revolving Credit Facility \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.20%
Basis spread on variable rate			1.00%
New Credit Facility [Member] \| Revolving Credit Facility \| LIBOR [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			0.875%
New Credit Facility [Member] \| Revolving Credit Facility \| LIBOR [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.55%
New Credit Facility [Member] \| Revolving Credit Facility \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
New Credit Facility [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity						65,000,000
New Credit Facility [Member] \| Swing-Loans [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 60,000,000
Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate			5.72%	5.72%	5.73%
Long-term Debt, Gross			$ 562,695,000	$ 655,934,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross			1,853,529,000	1,803,529,000
Recognized hedge activity		$ 800,000
Unsecured Debt [Member] \| 250.0M 4.10% Guaranteed Notes due 2024 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross			250,000,000	250,000,000
Debt instrument, Unamortized discount, Percent of face amount		99.388%
Debt instrument, Yield to maturity		4.175%
Debt instrument, Yield to maturity spread at time of pricing		1.70%
Debt Instrument, Unamortized Discount			$ 1,300,000	1,500,000
Debt Instrument Maturity Date			Oct. 01, 2024
Unsecured Debt [Member] \| $250M 4.55% Guaranteed Notes due 2029 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross			$ 250,000,000	250,000,000
Debt instrument, Unamortized discount, Percent of face amount		99.191%
Debt instrument, Yield to maturity		4.625%
Debt instrument, Yield to maturity spread at time of pricing		2.15%
Debt Instrument, Unamortized Discount			$ 1,800,000	2,000,000
Debt Instrument Maturity Date			Oct. 01, 2029
Unsecured Debt [Member] \| Notes 2024 and 2029 [Member]
Debt Instrument [Line Items]
Proceeds from Notes Payable		$ 492,900,000
Unsecured Debt [Member] \| $250.0M 5.400% Guaranteed Notes due 2014 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.40%
Extinguishment of Debt, Amount		75,100,000
Debt Instrument, Repurchased Face Amount		143,500,000
Debt Instrument, Redemption, Description			$1,026.88 per $1,000
Unsecured Debt [Member] \| 7.50% Guaranteed Notes due May 15, 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			7.50%
Extinguishment of Debt, Amount		42,700,000
Loss on early extinguishment of debt				5,000,000
Debt Instrument, Repurchased Face Amount		114,900,000
Debt Instrument, Redemption, Description			$1,070.24 per $1,000
Unsecured Debt [Member] \| Notes 2015 and 2015 [Member]
Debt Instrument [Line Items]
Loss on early extinguishment of debt				$ 2,600,000
Unsecured Debt [Member] \| Three Year Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		$ 150,000,000
Debt Instrument Maturity Date		Feb. 01, 2015
Unsecured Debt [Member] \| Four-Year Term Loan - Swapped to fixed [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		$ 100,000,000
Unsecured Debt [Member] \| Four-Year Term Loan - Variable [Member]
Debt Instrument [Line Items]
Debt Instrument Maturity Date		Feb. 01, 2016
Unsecured Debt [Member] \| Three and Four Year Term Loan [Member]
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost		$ 300,000
Unsecured Debt [Member] \| New Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument Maturity Date			May 15, 2019