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Stockholders' Equity - Summary of Stock Options Granted (Details) (USD $)	77 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 April 16, 2013 [Member]	Sep. 30, 2013 April 17, 2012 [Member]	Sep. 30, 2013 April 19, 2011 [Member]	Sep. 30, 2013 April 20, 2010 [Member]	Sep. 30, 2013 April 21, 2009 [Member]	Sep. 30, 2013 April 15, 2008 [Member]	Sep. 30, 2013 April 17, 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted	8,100,000	205,000	1,235,000	410,000	530,000	790,000	550,000	4,380,000
Option exercise (strike) price		$ 54	$ 54.00	$ 35.00	$ 30.00	$ 27.00	$ 27.00	$ 22.50
Closing stock price on date of grant		$ 49.25	$ 49.01	$ 31.78	$ 27.13	$ 17.61	$ 24.35	$ 20.15
Options outstanding	4,395,605	177,500	1,132,500	360,000	300,000	413,600	216,000	1,796,005
Options vested	1,414,855	0	0	0	0	173,600	114,750	1,126,505

X

- Definition

As of the balance sheet date, the number of shares into which fully vested stock options outstanding can be converted under the option plan.

+ References

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- Definition

Net number of share options (or share units) granted during the 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)(1)

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

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

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