Represents the term of extension option of the debt instrument.

No definition available.

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- Definition

Represents the amount of increase allowed in maximum borrowing capacity under the credit facility.

+ References

No definition available.

+ Details

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- Definition

Represents the amount of line of credit maximum borrowing capacity as a percentage of maximum principal amount.

+ References

No definition available.

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- Definition

The undiscounted sum of all amounts, including amounted deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date. This relates to loans accounted for as held-to-maturity debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

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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

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

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-Name Accounting Standards Codification
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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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- 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

Amount of the cost of borrowed funds accounted for as interest expense for 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)
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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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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

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ 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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Debt - Narrative (Details) - USD ($)				6 Months Ended
Debt - Narrative (Details) - USD ($)	Jun. 30, 2016	Jun. 10, 2016	Dec. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2016	Jan. 07, 2016
Debt
Total principal	$ 642,337,000		$ 488,926,000	$ 642,337,000
Interest expense, debt				7,500,000	$ 3,300,000
Certain Loans Acquired in Transfer Accounted for as Held-to-maturity Debt Securities, Outstanding Balance	0			0
Credit agreement
Debt
Maximum borrowing capacity under accordion feature	750,000,000		$ 750,000,000	750,000,000
Amount outstanding	378,000,000			378,000,000
Current borrowing capacity	$ 472,000,000			$ 472,000,000
Credit agreement \| Operating Partnership
Debt
Interest rate at end of period (as a percent)	2.89%			2.89%
Senior notes
Debt
Debt instrument, face amount							$ 150,000,000
Credit Agreement Amendment [Member]
Debt
Unused fee (as a percent)		0.25%
Maximum borrowing capacity as a percentage of maximum principal amount		10.00%
Increase in maximum borrowing capacity		$ 500,000,000
Maximum borrowing capacity under accordion feature		1,600,000,000
Current borrowing capacity		$ 1,100,000,000
Series A
Debt
Interest rate (as a percent)							4.03%
Series A \| Senior notes
Debt
Debt instrument, face amount							$ 15,000,000
Series B
Debt
Interest rate (as a percent)							4.43%
Series B \| Senior notes
Debt
Debt instrument, face amount							$ 45,000,000
Series C
Debt
Interest rate (as a percent)							4.57%
Series C \| Senior notes
Debt
Debt instrument, face amount							$ 45,000,000
Series D
Debt
Interest rate (as a percent)							4.74%
Series D \| Senior notes
Debt
Debt instrument, face amount							$ 45,000,000
London Interbank Offered Rate (LIBOR) \| Credit agreement
Debt
Reference rate (as a percent)	1.20%		1.20%
London Interbank Offered Rate (LIBOR) \| Credit Agreement Amendment [Member]
Debt
Reference rate (as a percent)		1.20%
London Interbank Offered Rate (LIBOR) \| Credit rating at least A- or A3 \| Adjusted LIBOR rate loans and letter of credit
Debt
Reference rate (as a percent)	0.85%
London Interbank Offered Rate (LIBOR) \| Credit rating at least BBBplus or BAA1 \| Adjusted LIBOR rate loans and letter of credit
Debt
Reference rate (as a percent)	0.90%
London Interbank Offered Rate (LIBOR) \| Credit rating at least BBB or BAA2 \| Adjusted LIBOR rate loans and letter of credit
Debt
Reference rate (as a percent)	1.00%
London Interbank Offered Rate (LIBOR) \| Credit rating at least BBB- or BAA3 \| Adjusted LIBOR rate loans and letter of credit
Debt
Reference rate (as a percent)	1.20%
London Interbank Offered Rate (LIBOR) \| Credit rating below BBB- or BAA3 \| Adjusted LIBOR rate loans and letter of credit
Debt
Reference rate (as a percent)	1.55%
Term Loan [Member] \| Credit Agreement Amendment [Member]
Debt
Current borrowing capacity		$ 250,000,000
Term Loan [Member] \| Base rate \| Credit rating at least A- or A3 \| Base rate loans
Debt
Reference rate (as a percent)				0.40%
Term Loan [Member] \| Base rate \| Credit rating at least BBBplus or BAA1 \| Base rate loans
Debt
Reference rate (as a percent)				0.45%
Term Loan [Member] \| Base rate \| Credit rating at least BBB or BAA2 \| Base rate loans
Debt
Reference rate (as a percent)				0.55%
Term Loan [Member] \| Base rate \| Credit rating at least BBB- or BAA3 \| Base rate loans
Debt
Reference rate (as a percent)				0.80%
Term Loan [Member] \| Base rate \| Credit rating below BBB- or BAA3 \| Base rate loans
Debt
Reference rate (as a percent)				1.25%
Credit agreement
Debt
Term of extension option		1 year
Credit agreement \| Credit Agreement Amendment [Member]
Debt
Current borrowing capacity		$ 850,000,000				$ 750,000,000
Credit agreement \| Base rate \| Credit rating at least A- or A3 \| Base rate loans
Debt
Reference rate (as a percent)				0.00%
Credit agreement \| Base rate \| Credit rating at least BBBplus or BAA1 \| Base rate loans
Debt
Reference rate (as a percent)				0.00%
Credit agreement \| Base rate \| Credit rating at least BBB or BAA2 \| Base rate loans
Debt
Reference rate (as a percent)				0.10%
Credit agreement \| Base rate \| Credit rating at least BBB- or BAA3 \| Base rate loans
Debt
Reference rate (as a percent)				0.20%
Credit agreement \| Base rate \| Credit rating below BBB- or BAA3 \| Base rate loans
Debt
Reference rate (as a percent)				0.60%