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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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Period Type:	instant

- Definition

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

+ 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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- 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.

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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

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Debt Obligations (2017 Debt Transactions) (Details) - USD ($)	1 Months Ended			3 Months Ended		9 Months Ended
	Jul. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jul. 28, 2017
Debt Instrument [Line Items]
Loss on extinguishment of debt, net				$ (1,828,000)	$ 1,042,000	$ (488,000)	$ 949,000
Secured loans \| Term Loan
Debt Instrument [Line Items]
Debt repaid						380,300,000
Unsecured debt \| Term Loan
Debt Instrument [Line Items]
Term loan face amount				$ 210,000,000		210,000,000
Debt repaid						790,000,000
Loss on extinguishment of debt, net						500,000
Unsecured debt \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt repaid						$ 122,000,000
3.90% Senior Notes due 2027
Debt Instrument [Line Items]
Term loan face amount			$ 400,000,000
Stated percentage			3.90%
Redemption price, percentage of principal amount			100.00%
3.65% Senior Notes due 2024 \| Term Loan
Debt Instrument [Line Items]
Term loan face amount		$ 500,000,000.0
Stated percentage		3.65%
Redemption price, percentage of principal amount		100.00%
2024 Term Loan \| Unsecured debt \| Term Loan
Debt Instrument [Line Items]
Stated percentage								1.90%
Unsecured $300M Term Loan \| Unsecured debt \| Term Loan
Debt Instrument [Line Items]
Term loan face amount	$ 300,000,000.0							$ 300,000,000
Stated percentage				3.13722%		3.13722%
Debt instrument, term	7 years