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Convertible 3.75% Senior Notes (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Fair Value of Convertible Feature of Convertible 3.75% Senior Notes, Decrease in Fair Value	$ 8,625
Fair Value of Convertible Feature of Convertible 3.75% Senior Notes, Ending balance	32,775us-gaap_DerivativeLiabilities
Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Fair Value of Convertible Feature of Convertible 3.75% Senior Notes, Initial Measurement Begining balance		43,700
Fair Value of Convertible Feature of Convertible 3.75% Senior Notes, Decrease in Fair Value		2,300
Fair Value of Convertible Feature of Convertible 3.75% Senior Notes, Ending balance		$ 41,400

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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