Earnings Per Share (Schedule of Convertible Note Premium Share Information) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2013 USD ($) shares $ / shares	Dec. 31, 2012 USD ($) shares $ / shares
2011 4.0% Notes [Member]
Premium Share Information:
Per share price, actual average (in dollars per share) \| $ / shares	$ 30.86	$ 18.68
Premium value (in dollars) \| $	$ 100,911	$ 19,494
2011 4.0% Notes [Member] \| Common Stock [Member]
Premium Share Information:
Number of conversion shares, principal amount (in shares)	6,683	6,683
2011 4.0% Notes [Member] \| Common Stock [Member] \| Convertible Debt [Member]
Premium Share Information:
Premium shares (in shares)	3,270	1,044
2011 4.25% Notes [Member]
Premium Share Information:
Per share price, actual average (in dollars per share) \| $ / shares	$ 30.86	$ 18.68
Premium value (in dollars) \| $	$ 96,423	$ 20,064
2011 4.25% Notes [Member] \| Common Stock [Member]
Premium Share Information:
Number of conversion shares, principal amount (in shares)	6,268	6,268
2011 4.25% Notes [Member] \| Common Stock [Member] \| Convertible Debt [Member]
Premium Share Information:
Premium shares (in shares)	3,125	1,074

Price of a single share of a number of saleable stocks of a company over a period of time.

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- Definition

The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

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- Definition

The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

+ References

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 210.5-02.22(a)(5))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 55

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-Glossary Contingently Issuable Shares

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