FAIR VALUE MEASUREMENTS Additional Disclosures 2 (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Estimated fair value measurements
Other assets	$ 16,300us-gaap_OtherAssets
Fair Value, Measurements, Recurring [Member] \| Carrying Value [Member]
Estimated fair value measurements
Assets - cash equivalents	314,570	1,063,500
Other assets	16,304
Fair Value, Measurements, Non-Recurring [Member]
Estimated fair value measurements
Property and equipment, net	(565,650)
Fair Value, Measurements, Non-Recurring [Member] \| Carrying Value [Member]
Estimated fair value measurements
Property and equipment, net	275,148
Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Estimated fair value measurements
Assets - cash equivalents	314,570	1,063,500
Other assets	16,304
Level 1 [Member] \| Fair Value, Measurements, Non-Recurring [Member]
Estimated fair value measurements
Property and equipment, net	0
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Estimated fair value measurements
Assets - cash equivalents	0	0
Other assets	0
Level 2 [Member] \| Fair Value, Measurements, Non-Recurring [Member]
Estimated fair value measurements
Property and equipment, net	0
Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Estimated fair value measurements
Assets - cash equivalents	0	0
Other assets	0
Level 3 [Member] \| Fair Value, Measurements, Non-Recurring [Member]
Estimated fair value measurements
Property and equipment, net	$ 275,148

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 7

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- Definition

Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258

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