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LEASES - Supplemental Cash Flow Information Related to Leases (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
LEASES
Cash paid for amounts included in measurement of lease liabilities:- Operating cash flows from finance leases	¥ (389,679)	¥ (248,417)
Cash paid for amounts included in measurement of lease liabilities:- Operating cash flows from operating leases	(141,480)	(116,295)
Cash paid for amounts included in measurement of lease liabilities:- Financing cash flows from finance leases	(198,234)	(302,679)
Non-cash information on lease liabilities arising from obtaining ROU assets- Finance leases	1,099,698	708,757
Non-cash information on lease liabilities arising from obtaining ROU assets- Operating leases	553,154	333,775
Cash paid for purchase of land use rights and initial direct costs	¥ 744,761	¥ 800,431

X

- Definition

The cash outflow paid to purchase of land use rights and initial direct costs.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of interest paid on finance lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
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+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of cash outflow for principal payment on finance lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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X

- References

No definition available.

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X

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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X

- Definition

Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

+ References

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-Publisher FASB
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X

- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

+ References

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