Operating Leases - Schedule of Future Minimum Rental Payments Under Non-Cancelable Operating Leases (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2019	$ 46,941
2020	56,531
2021	49,789
2022	44,642
2023	42,008
Thereafter	116,756
Total future minimum rental payments	356,667
Non-Related Third Party [Member]
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2019	31,888
2020	36,381
2021	29,551
2022	24,315
2023	21,591
Thereafter	68,819
Total future minimum rental payments	212,545
Circle K [Member]
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2019	10,634
2020	14,178
2021	14,178
2022	14,178
2023	14,178
Thereafter	18,850
Total future minimum rental payments	86,196
DMS [Member]
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2019	4,419
2020	5,972
2021	6,060
2022	6,149
2023	6,239
Thereafter	29,087
Total future minimum rental payments	$ 57,926

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Amount of lease payments to be received by lessor for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919396-209981

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Amount of lease payments to be received by lessor in period after fifth rolling twelve months following latest statement of financial position date for operating lease. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919396-209981

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Amount of lease payments to be received by lessor in remainder of fiscal year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

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Amount of lease payments to be received by lessor in fifth rolling twelve months following latest statement of financial position date for operating lease. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

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Amount of lease payments to be received by lessor in fourth rolling twelve months following latest statement of financial position date for operating lease. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

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Amount of lease payments to be received by lessor in third fiscal year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

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Amount of lease payments to be received by lessor in second fiscal year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

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