Number Of Properties Subject To Leases

No definition available.

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- Definition

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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- Definition

Carrying amount as of the balance sheet date of obligations due all related parties.

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Balance Type:	credit
Period Type:	instant

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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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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- Details

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- Details

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Related-Party Transactions (Details)	9 Months Ended
Related-Party Transactions (Details)	Sep. 30, 2018 USD ($) property	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items]
Operating leases, year two	$ 782,000
Operating leases, year three	721,000
Operating leases, year four	721,000
Payable to related parties	0		$ 20,000
Receivable from related parties	$ 0		$ 0
Related party leasing
Related Party Transaction [Line Items]
Number of properties adjacent to corporate office subject to leases \| property	5
Related party transportation services
Related Party Transaction [Line Items]
Expenses with related party	$ 300,000	$ 200,000
Related party equipment rental
Related Party Transaction [Line Items]
Expenses with related party	$ 100,000	$ 100,000
Corporate offices \| Related party leasing
Related Party Transaction [Line Items]
Lease term	5 years
Extension option term	5 years
Operating leases	$ 100,000
Property 1 \| Related party leasing
Related Party Transaction [Line Items]
Operating leases	30,000
Operating leases, year two	30,000
Operating leases, year three	100,000
Operating leases, year four	100,000
Operating leases, year five	$ 200,000