Condensed Consolidating Information (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities	$ 100,602	$ 165,997	$ 122,020	$ 169,934
Net cash provided by (used in) investing activities	873	(32,834)	(46,546)	(52,670)
Net cash provided by (used in) financing activities	(38,346)	(16,282)	(45,297)	(26,086)
Increase in cash and equivalents	63,129	116,881	30,177	91,178
Cash and equivalents at beginning of period	357,809	160,810	390,761	186,513
Cash and equivalents at end of period	420,938	277,691	420,938	277,691
Parent
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities			24,722	158,937
Net cash provided by (used in) investing activities			8,922	(14,734)
Net cash provided by (used in) financing activities			(29,910)	(53,645)
Increase in cash and equivalents			3,734	90,558
Cash and equivalents at beginning of period			301,073	173,563
Cash and equivalents at end of period	304,807	264,121	304,807	264,121
Guarantors
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities			116,105	34,056
Net cash provided by (used in) investing activities			(55,747)	(25,017)
Net cash provided by (used in) financing activities			(13,809)	(10,497)
Increase in cash and equivalents			46,549	(1,458)
Cash and equivalents at beginning of period			58,699	10,628
Cash and equivalents at end of period	105,248	9,170	105,248	9,170
Combined Non-Guarantors
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities			(23,941)	(14,392)
Net cash provided by (used in) investing activities			(54,773)	(12,919)
Net cash provided by (used in) financing activities			58,608	29,389
Increase in cash and equivalents			(20,106)	2,078
Cash and equivalents at beginning of period			30,989	2,322
Cash and equivalents at end of period	10,883	4,400	10,883	4,400
Consolidating Adjustments
Condensed Consolidating Financial Statements
Net cash provided by (used in) operating activities			5,134	(8,667)
Net cash provided by (used in) investing activities			55,052
Net cash provided by (used in) financing activities			$ (60,186)	$ 8,667

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

The net cash from (used in) the entity's investing activities specifically EXCLUDING the cash flows derived by the entity from its discontinued operations, if any. This element is only to be used when the entity reports its cash flows attributable to discontinued operations separately from the cash flow provided by or used in investing activities. Such reporting would necessitate the entity to use the Net Cash provided by or used in Discontinued Operations, Total element provided in the taxonomy.

+ References+ Details

- Definition

The net cash from (used in) the entity's continuing operations. This element specifically EXCLUDES the cash flows derived by the entity from its discontinued operations, if any. This element is only to be used when the entity reports its cash flows attributable to discontinued operations separately from the cash flow provided by or used in operating activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

+ References+ Details