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Short-term Investments (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items] |  |  |
Proceeds from Sale of Available-for-sale Securities | $ 239,370,000 | $ 322,236,000 | $ 60,000
Available-for-sale securities, amortized cost | 130,971,000 | 90,648,000 |
Available-for-sale securities, gross unrealized gains | 21,000 | 20,000 |
Available-for-sale securities, gross unrealized losses | (975,000) | (1,193,000) |
Available-for-sale securities, fair value | 130,017,000 | 89,475,000 |
Available-for-sale Securities, Gross Realized Gains | 1,174,000 | 31,000 |
Available-for-sale Securities, Gross Realized Losses | 981,000 | 555,000 |
Proceeds from Sale and Maturity of Marketable Securities |  | 319,811,000 | 0
US Treasury Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, amortized cost | 130,971,000 | 87,394,000 |
Available-for-sale securities, gross unrealized gains | 21,000 | 20,000 |
Available-for-sale securities, gross unrealized losses | (975,000) | (411,000) |
Available-for-sale securities, fair value | 130,017,000 | 87,003,000 |
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, amortized cost |  | 3,254,000 |
Available-for-sale securities, gross unrealized gains |  | 0 |
Available-for-sale securities, gross unrealized losses |  | (782,000) |
Available-for-sale securities, fair value |  | $ 2,472,000 |
Minimum [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investment Maturity Date | Dec. 31, 2014 | Dec. 31, 2013 |
Maximum [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investment Maturity Date | Dec. 31, 2015 | Dec. 31, 2014 |

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