Long-Term Debt Long-Term Debt - Convertible Notes Interest Expense (Details) (Convertible Notes [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Convertible Notes [Member]
Debt Instrument [Line Items]
Interest per contractual rate	$ 13,939	$ 0
Amortization of debt discount	6,598	0
Amortization of debt issuance costs	14	0
Total interest expense related to the Convertible Notes	$ 20,551	$ 0

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

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-Name Accounting Standards Codification

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

+ References

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