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Capital Stock (Details) (USD $)
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12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | |||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Nov. 15, 2011
3 7/8% Convertible Senior Notes due 2011 upon maturity
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Nov. 30, 2011
3 7/8% Convertible Senior Notes due 2011 upon maturity
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Jun. 30, 2012
Common Stock Par Value
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Feb. 28, 2011
Common Stock Par Value
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Dec. 31, 2012
Common Stock Par Value
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Dec. 31, 2011
Common Stock Par Value
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Dec. 31, 2012
Funds [Member]
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| Capital Stock | ||||||||||
| Stock repurchased, shares | 3,700,000 | |||||||||
| Number of shares of common stock issued and sold in an underwritten public offering | 5,980,000 | 5,563,000 | ||||||||
| Issuance of common stock | $ 342,469,000 | $ 299,558,000 | $ 342,500,000 | $ 1,495,000 | $ 1,627,000 | |||||
| Aggregate shares of common stock issued for the conversion value in excess of the principal amount | 943,714 | 943,714 | ||||||||
| Principal amount repaid | 230,000,000 | |||||||||
| Interest rate (as a percent) | 9.00% | 7.125% | 3.875% | 3.875% | ||||||
| Accumulated Other Comprehensive Income | ||||||||||
| Foreign currency translation | 23,441,000 | 21,066,000 | ||||||||
| Unrealized gain on marketable debt securities | 807,000 | 2,103,000 | ||||||||
| Other | (894,000) | (1,107,000) | ||||||||
| Total accumulated other comprehensive income | $ 23,354,000 | $ 22,062,000 | ||||||||
| X | ||||||||||
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- Definition
Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Decrease for amounts repaid on the debt instrument for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Interest rate stated in the contractual debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Represents details pertaining to other accumulated other comprehensive income. No definition available.
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