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Marketable Investments (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis | $ 176,774 | $ 153,342
Level 1 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis | 815 | 5,786
Level 2 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis | 166,989 | 137,991
Level 3 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis | 8,970 | 9,565
Money market funds [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis | 815 | 5,786
Money market funds [Member] | Level 1 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis | 815 | 5,786
Money market funds [Member] | Level 2 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis |  |
Money market funds [Member] | Level 3 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis |  |
State and municipal obligations [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis | 18,872 | 9,482
State and municipal obligations [Member] | Level 1 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis |  |
State and municipal obligations [Member] | Level 2 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis | 18,872 | 9,482
State and municipal obligations [Member] | Level 3 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis |  |
Federal agency and corporate obligations [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis | 148,117 | 128,509
Federal agency and corporate obligations [Member] | Level 1 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis |  |
Federal agency and corporate obligations [Member] | Level 2 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis | 148,117 | 128,509
Federal agency and corporate obligations [Member] | Level 3 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis |  |
ARS [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis | 8,970 | 9,565
ARS [Member] | Level 1 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis |  |
ARS [Member] | Level 2 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis |  |
ARS [Member] | Level 3 [Member] |  |
Summary of Company's fair value hierarchy for its financial assets |  |
Fair value of assets on recurring basis | $ 8,970 | $ 9,565

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAlternativeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration