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Stockholders' Equity and Stock-Based Compensation Plans (Details 1) (Phantom Share Units PSUs [Member], USD $)	3 Months Ended
	Mar. 31, 2013
Summary of transactions of the Company's SEUs
Outstanding, Number of Options, Beginning balance	623,828
Exercised, Number of Options	(150,171)
Forfeited, Number of Options	(2,361)
Outstanding, Number of Options, Ending balance	523,294
Outstanding, Weighted Average Exercise Price, Beginning balance	$ 2.95
Exercised, Weighted Average Exercise Price	$ 2.90
Forfeited, Weighted Average Exercise Price	$ 10.38
Outstanding, Weighted Average Exercise Price, Ending balance	$ 3.18
Discount [Member]
Summary of transactions of the Company's SEUs
Granted, Number of Options	45,028
Granted, Weighted Average Exercise Price	$ 0.00
Granted, Weighted Average Grant-Date Fair Value	$ 32.06
Market Value [Member]
Summary of transactions of the Company's SEUs
Granted, Number of Options	6,970
Granted, Weighted Average Exercise Price	$ 41.31
Granted, Weighted Average Grant-Date Fair Value	$ 16.09

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options exercised.

+ References

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options exercised in period weighted average exercise price.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options grants in period weighted average exercise price.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options outstanding number.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options outstanding weighted average exercise price.

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- Definition

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

+ 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)(1)(iv)(3)

-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)(e)

-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 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

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 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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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



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

-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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