Cash, Cash Equivalents and Available for Sale Securities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Cash, Cash Equivalents and Available for Sale Securities
Cash	$ 4,700	$ 6,800
Investments in U.S. Treasury money market funds and U.S. Treasury securities with maturities less than 90 days	35,100	$ 203,800
Available for sale securities, including carrying value and estimated fair values
Unrealized loss, net of tax	100
Cost	423,859
Unrealized Loss	113
Changes in accumulated other comprehensive loss
Current period changes in fair value, net of tax	(65)
Ending balance	(65)
Fair Value
Available for sale securities, including carrying value and estimated fair values
Value	423,746
Carrying Value
Available for sale securities, including carrying value and estimated fair values
Value	423,746
U.S. Treasury securities with maturities less than one year
Available for sale securities, including carrying value and estimated fair values
Cost	423,859
Unrealized Loss	113
U.S. Treasury securities with maturities less than one year \| Fair Value
Available for sale securities, including carrying value and estimated fair values
Value	423,746
U.S. Treasury securities with maturities less than one year \| Carrying Value
Available for sale securities, including carrying value and estimated fair values
Value	$ 423,746

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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