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Term Loans (Details)	1 Months Ended			12 Months Ended
	Jan. 31, 2018 item	Jun. 30, 2015 USD ($)	Jan. 31, 2013 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Senior Unsecured Term Loans
Term Loans
Deferred finance costs				$ 580,000	$ 873,000
Senior Unsecured Term Loans | $250 million senior unsecured term loan
Term Loans
Face amount of loans		$ 250,000,000
Variable reference rate		one-month LIBOR
Basis spread on variable rate (as a percent)		0.90%
Deferred financing costs incurred				1,200,000
Senior Unsecured Term Loans | Interest rate swaps | $250 million senior unsecured term loan
Term Loans
Effective yield (as a percent)		2.62%
Senior Unsecured Term Loans | ARCT | $70 million senior unsecured term loan
Term Loans
Face amount of loans			$ 70,000,000
Variable reference rate	one-month LIBOR		one-month LIBOR
Basis spread on variable rate (as a percent)	0.90%		1.10%
Loan extension period	6 months
Number Of Optional Extension Period | item	2
Deferred financing costs incurred				303,000
Senior Unsecured Term Loans | ARCT | Interest rate swaps | $70 million senior unsecured term loan
Term Loans
Effective yield (as a percent)			2.05%
Promissory Note | $125.9 million promissory note
Term Loans
Face amount of loans				$ 125,900,000
Stated interest rate (as a percent)				1.52%

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Loan extension period, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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

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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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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-Name Accounting Standards Codification
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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The cash outflow for loan and debt issuance costs.

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