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Summary of Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maximum maturity term of financial assets	90 days
Note receivable	$ 8,098	$ 8,098
Indebtedness, Carrying value	$ 914,079	$ 766,964
Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable fair value variance from carrying value (as a percent)	1.10%	5.10%
Total indebtedness fair value variance from carrying value (as a percent)	94.50%	94.80%
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable fair value variance from carrying value (as a percent)	11.80%	16.20%
Total indebtedness fair value variance from carrying value (as a percent)	104.40%	104.70%

X

- Definition

Indebtedness fair value percent variance from carrying value

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Maturity period of cash and cash equivalents maximum.

+ References

No definition available.

+ Details

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X

- Definition

Notes receivable fair value percent variance from carrying value.

+ References

No definition available.

+ Details

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X

- 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
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-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
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- 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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X

- Definition

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ 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 210.5-02.3)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Details

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