|
Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified |
Dec. 31, 2011
|
Dec. 31, 2010
|
|---|---|---|
| Current assets: | ||
| Allowance for uncollectible accounts | $ 639 | $ 17 |
| Short-term investments, amortized cost | 129,232 | 21,141 |
| Long-term investments, amortized cost | 497,805 | 585,862 |
| Restricted deposits, amortized cost | 26,751 | 22,755 |
| Accumulated depreciation | $ 177,294 | $ 138,629 |
| Stockholders' equity: | ||
| Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Common stock, shares authorized (in shares) | 100,000,000 | 100,000,000 |
| Common stock, shares issued (in shares) | 53,586,726 | 52,172,037 |
| Common stock, shares outstanding (in shares) | 50,864,618 | 49,616,824 |
| Treasury stock, shares (in shares) | 2,722,108 | 2,555,213 |
| X | ||||||||||
|
- Definition
The total amount of investments that are intended to be held for an extended period of time, at amortized cost (longer than one operating cycle). No definition available.
|
| X | ||||||||||
|
- Definition
Other long-term assets not otherwise listed in the existing taxonomy that are pledged or subject to withdrawal restrictions, at amortized cost. No definition available.
|
| X | ||||||||||
|
- Definition
Short-term investments, at amortized cost. No definition available.
|
| X | ||||||||||
|
- Definition
The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|