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Nature of Operations and Summary of Significant Accounting Policies (Details 2) (USD $) | Dec. 31, 2012 Y | Dec. 31, 2011
--- | --- | ---
Cash and Cash Equivalents |  |
Restricted cash | $ 19,553,000 | $ 19,434,000
Marketable Securities |  |
Cost | 559,409,000 | 501,181,000
Unrealized appreciation | 552,000 | 164,000
Total marketable securities | 559,961,000 | 501,345,000
Market Value | 559,961,000 | 501,345,000
Maturities of marketable securities |  |
Year 2013 | 327,942,000 |
Years 2014 through 2017 | 160,116,000 |
Years 2018 through 2022 | 4,060,000 |
Thereafter | 67,843,000 |
Marketable securities | 556,100,000 |
Maximum period for redemption (in year) | 1 |
Investment as non-current | 3,800,000 |
Commercial paper |  |
Marketable Securities |  |
Cost | 3,510,000 | 4,555,000
Market Value | 3,514,000 | 4,557,000
Bond and bond funds |  |
Marketable Securities |  |
Cost | 555,603,000 | 496,170,000
Market Value | 556,133,000 | 496,310,000
Asset backed securities |  |
Marketable Securities |  |
Cost | 296,000 | 456,000
Market Value | $ 314,000 | $ 478,000

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