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Investments (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Investments |  |
Total available-for-sale and trading short term investments, amortized cost | $ 290,042,000 | $ 308,064,000
Total available-for-sale and trading short term investments, fair value | 290,649,000 | 313,379,000
Estimated fair value of fixed rate securities designated as available-for-sale, classified by the contractual maturity date of the security |  |
Due within one year | 4,605,000 |
Due after one year through three years | 37,111,000 |
Due after three years | 58,768,000 |
Total fixed rate securities | 100,484,000 |
Available-for-sale securities |  |
Investments |  |
Amortized Cost | 224,314,000 | 279,556,000
Fair Value | 224,076,000 | 282,829,000
Money market funds |  |
Investments |  |
Amortized Cost | 88,430,000 | 126,537,000
Fair Value | 88,430,000 | 126,537,000
Money market funds | Denominated in Canadian dollars |  |
Investments |  |
Fair Value | 16,144,000 | 2,441,000
Money market funds | Denominated in Euros |  |
Investments |  |
Fair Value | 11,715,000 | 6,437,000
Corporate bonds |  |
Investments |  |
Amortized Cost | 69,591,000 | 67,275,000
Fair Value | 70,258,000 | 69,214,000
U.S. Government agency securities |  |
Investments |  |
Amortized Cost | 27,299,000 | 23,647,000
Fair Value | 27,147,000 | 23,775,000
Emerging markets debt mutual fund |  |
Investments |  |
Amortized Cost | 17,693,000 | 17,693,000
Fair Value | 16,941,000 | 18,734,000
Asset backed debt securities |  |
Investments |  |
Amortized Cost | 8,446,000 | 12,180,000
Fair Value | 8,477,000 | 12,238,000
Collateralized mortgage obligations |  |
Investments |  |
Amortized Cost | 7,597,000 | 15,059,000
Fair Value | 7,600,000 | 15,162,000
U.S. Treasury securities |  |
Investments |  |
Amortized Cost | 5,258,000 | 17,165,000
Fair Value | 5,223,000 | 17,169,000
High yield trading debt securities |  |
Investments |  |
Amortized Cost | 49,352,000 | 21,839,000
Fair Value | 50,428,000 | 23,406,000
Money market funds held in trading accounts |  |
Investments |  |
Amortized Cost | 11,033,000 |
Fair Value | 11,033,000 |
Emerging markets trading debt mutual fund |  |
Investments |  |
Amortized Cost | 3,202,000 | 3,046,000
Fair Value | 2,858,000 | 3,237,000
Emerging markets trading debt securities |  |
Investments |  |
Amortized Cost | 1,300,000 | 2,361,000
Fair Value | 1,336,000 | 2,600,000
Other trading investments |  |
Investments |  |
Amortized Cost | 841,000 | 1,262,000
Fair Value | $ 918,000 | $ 1,307,000

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