Share-Based Compensation (Details 2) (USD $)	12 Months Ended
Dec. 31, 2012 Restricted Stock RSU [Member] Liability Based Awards [Member]	Dec. 31, 2011 Restricted Stock RSU [Member] Liability Based Awards [Member]	Dec. 31, 2010 Restricted Stock RSU [Member] Liability Based Awards [Member]	Dec. 31, 2012 PBRS [Member]	Dec. 31, 2011 PBRS [Member]	Dec. 31, 2010 PBRS [Member]	Dec. 31, 2012 PBRS [Member] Liability Based Awards [Member]	Dec. 31, 2011 PBRS [Member] Liability Based Awards [Member]	Dec. 31, 2010 PBRS [Member] Liability Based Awards [Member]	Dec. 31, 2012 PUP Awards [Member] Liability Based Awards [Member]	Dec. 31, 2011 PUP Awards [Member] Liability Based Awards [Member]	Dec. 31, 2009 PUP Awards [Member] Liability Based Awards [Member]
Summary of liability-based award activity
Beginning Balance, Weighted-Average Grant Date Fair Value	$ 19.07	$ 17.18	$ 15.36	$ 15.36	$ 33.02	$ 20.77	$ 15.36	$ 15.36	$ 15.36	$ 23.02	$ 33.81	$ 33.81
Beginning Balance, Shares	38,600	26,050	13,700	416	18,830	174,927	1,956	3,914	13,900	95,500	102,960	102,960
Granted, Shares	15,850	12,550	12,350			29,547				115,100	95,500
Granted, Weighted-Average Grant Date Fair Value	$ 20.57	$ 23.01	$ 19.20			$ 35.31			$ 15.36	$ 20.60	$ 23.02
Vested, Shares	(13,100)			(416)	(18,414)		(1,956)	(1,958)	(1,958)
Vested, Weighted-Average Grant Date Fair Value	$ 15.36			$ 15.36	$ 33.42		$ 15.36	$ 15.36
Forfeited or Cancelled, Shares	(850)					(126,550)			(8,028)		(102,960)
Forfeited or Cancelled, Weighted-Average Grant Date Fair Value	$ 20.89					$ 15.36			$ 15.36		$ 33.81
Ending Balance, Weighted-Average Grant Date Fair Value	$ 20.82	$ 19.07	$ 17.18		$ 15.36	$ 33.02		$ 15.36	$ 15.36	$ 21.70	$ 23.02	$ 33.81
Ending Balance, Shares	40,500	38,600	26,050		416	18,830		1,956	3,914	210,600	95,500	102,960

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(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.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(c)

-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.

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(a)

-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.

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(a)

-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.

+ Details

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

+ Details

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

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