Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

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 210.5-02.1)
-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 1
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 7
-Footnote 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 8, 9
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 7, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

+ Details

- Definition

Fair value of liability associated with derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details

- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References+ Details

FAIR VALUE MEASUREMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009	Jun. 30, 2011 Canadian Credit Facility Carrying Amount	Jun. 30, 2011 8% Senior Notes due 2011 Carrying Amount	Dec. 31, 2010 8% Senior Notes due 2011 Carrying Amount	Jun. 30, 2011 7% Senior Subordinated Notes due 2013 Carrying Amount	Dec. 31, 2010 7% Senior Subordinated Notes due 2013 Carrying Amount	Jun. 30, 2011 8 1/2% Senior Notes due 2014 Carrying Amount	Dec. 31, 2010 8 1/2% Senior Notes due 2014 Carrying Amount	Jun. 30, 2011 7 1/4% Senior Notes due 2019 Carrying Amount	Dec. 31, 2010 7 1/4% Senior Notes due 2019 Carrying Amount	Jun. 30, 2011 Carrying Amount	Dec. 31, 2010 Carrying Amount	Jun. 30, 2011 Canadian Credit Facility Fair Value	Jun. 30, 2011 8% Senior Notes due 2011 Fair Value	Dec. 31, 2010 8% Senior Notes due 2011 Fair Value	Jun. 30, 2011 7% Senior Subordinated Notes due 2013 Fair Value	Dec. 31, 2010 7% Senior Subordinated Notes due 2013 Fair Value	Jun. 30, 2011 8 1/2% Senior Notes due 2014 Fair Value	Dec. 31, 2010 8 1/2% Senior Notes due 2014 Fair Value	Jun. 30, 2011 7 1/4% Senior Notes due 2019 Fair Value	Dec. 31, 2010 7 1/4% Senior Notes due 2019 Fair Value	Jun. 30, 2011 Fair Value	Dec. 31, 2010 Fair Value	Jun. 30, 2011 8% Senior Notes due 2011	Dec. 31, 2010 8% Senior Notes due 2011	Jun. 30, 2011 7% Senior Subordinated Notes due 2013	Dec. 31, 2010 7% Senior Subordinated Notes due 2013	May 31, 2010 7% Senior Subordinated Notes due 2013	Jun. 30, 2011 8 1/2% Senior Notes due 2014	Dec. 31, 2010 8 1/2% Senior Notes due 2014	Jun. 30, 2011 7 1/4% Senior Notes due 2019	Dec. 31, 2010 7 1/4% Senior Notes due 2019
Fair value and carrying value of financial instruments
Cash and cash equivalents	$ 479,149	$ 218,145	$ 200,786	$ 467,221										$ 479,149	$ 218,145										$ 479,149	$ 218,145
Derivative instruments assets	70,900													70,949	68,426										70,949	68,426
Derivative instruments liabilities	47,800													47,818	36,413										47,818	36,413
Line of credit					280,973											280,973
Notes payable						$ 286,031	$ 287,092	$ 12	$ 12	$ 584,677	$ 581,790	$ 1,000,449	$ 1,000,478				$ 293,051	$ 300,658	$ 12	$ 12	$ 653,250	$ 660,000	$ 1,022,480	$ 1,022,670
Interest rate (as a percent)	7.75%																										8.00%	8.00%	7.00%	7.00%	7.00%	8.50%	8.50%	7.25%	7.25%
Maximum original maturity period of highly liquid investments to be considered cash equivalents (in months)	3