Quarterly report pursuant to Section 13 or 15(d)

Cover
- DOCUMENT AND ENTITY INFORMATION
Financial Statements
Notes to Financial Statements
Accounting Policies
- Basis of Presentation (Policies)
Notes Tables
Notes Details

Related-Party Transactions (Details)

v3.10.0.1

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

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