Changes in Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Increase (Decrease) in Equity
Balances	$ 2,377,842
Proceeds from the exercise of stock options, including related tax effect	7,614
Dividends declared	(24,238)
Equity-based compensation and issuance of restricted stock	4,309
Contributions from noncontrolling investors	112
Distributions to noncontrolling investors	(301)
Net income (loss)	41,252	41,777
Balances	2,406,590
Common Stock
Increase (Decrease) in Equity
Balances	637
Proceeds from the exercise of stock options, including related tax effect	2
Balances	639
Additional Paid-In Capital
Increase (Decrease) in Equity
Balances	1,037,687
Proceeds from the exercise of stock options, including related tax effect	7,612
Equity-based compensation and issuance of restricted stock	2,906
Acquisition of noncontrolling interest	(2,232)
Balances	1,045,973
Retained Earnings
Increase (Decrease) in Equity
Balances	2,087,620
Dividends declared	(24,238)
Net income (loss)	48,215
Balances	2,111,597
Treasury Stock
Increase (Decrease) in Equity
Balances	(720,479)
Equity-based compensation and issuance of restricted stock	1,403
Balances	(719,076)
Noncontrolling Interests
Increase (Decrease) in Equity
Balances	(27,623)
Acquisition of noncontrolling interest	2,232
Contributions from noncontrolling investors	112
Distributions to noncontrolling investors	(301)
Net income (loss)	(6,963)
Balances	(32,543)
Redeemable Noncontrolling Interests
Increase (Decrease) in Equity
Balances	98,814
Contributions from noncontrolling investors	600
Balances	$ 99,414

Represents an increase in noncontrolling interest from issuance of additional equity interests to noncontrolling interest holders or the sale of a portion of the parent's controlling interest.

+ References+ Details

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

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

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 29

-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 AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 5

-Subparagraph b

-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 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 810

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

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-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 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 38

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-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

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=18733213&loc=SL4591551-111686

+ Details

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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- Definition

Value of stock issued as a result of the exercise of stock options.

+ References+ Details