Cash, Cash Equivalents and Available for Sale Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Cash, Cash Equivalents and Available for Sale Securities
Cash	$ 4,700,000us-gaap_Cash	$ 6,800,000us-gaap_Cash
U.S. Treasury Securities with original maturities of less than three months and money market funds invested in U.S. Treasury Securities	35,100,000us-gaap_CashEquivalentsAtCarryingValue	203,800,000us-gaap_CashEquivalentsAtCarryingValue
Available for sale securities, including carrying value and estimated fair values
Unrealized loss, net of tax	100,000
Cost	423,859,000
Unrealized Loss	(113,000)
Fair Value
Available for sale securities, including carrying value and estimated fair values
Value	423,746,000
Carrying Value
Available for sale securities, including carrying value and estimated fair values
Value	423,746,000
U.S. Treasury securities with maturities less than one year
Available for sale securities, including carrying value and estimated fair values
Cost	423,859,000
Unrealized Loss	(113,000)
U.S. Treasury securities with maturities less than one year \| Fair Value
Available for sale securities, including carrying value and estimated fair values
Value	423,746,000
U.S. Treasury securities with maturities less than one year \| Carrying Value
Available for sale securities, including carrying value and estimated fair values
Value	$ 423,746,000

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Name Accounting Standards Codification

-Topic 210

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-Subparagraph (SX 210.5-02.1)

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Subparagraph (SX 210.5-02.1)

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