Convertible Senior Notes - Schedule of Interest Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Amortization of debt discount	$ 23,293	$ 0	$ 0
Senior Notes Due 2019
Debt Instrument [Line Items]
Contractual interest expense	4,792
Amortization of debt issuance costs	2,461
Amortization of debt discount	20,832
Interest Expense, Debt	$ 28,085

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.

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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.

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

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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.

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