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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 467,421	$ 378,358	$ 437,624	$ 424,155
Short-term investments	110,352	100,676
Long-term investments	40,120	50,305
Fair value assumption, interest rate	6.95%
Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term investment maturities	Nov. 30, 2014
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term investment maturities	Dec. 15, 2014
Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	467,421	378,358
Fair Value | Level 1 | 6.95% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	345,967	376,610
Fair Value | Level 2 | 6.7% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	529,204	582,744
Fair Value | U.S. Treasury Notes | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	110,352	100,676
Long-term investments	40,141	50,339
Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	467,421	378,358
Book Value | 6.95% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	342,000	342,000
Book Value | 6.7% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	532,319	532,194
Book Value | U.S. Treasury Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	110,352	100,676
Long-term investments	$ 40,120	$ 50,305

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Date of maturity of a debt security categorized as held-to-maturity, in CCYY-MM-DD format.

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+ References

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