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Convertible Notes (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Interest expense related to notes
Amortization of discount and debt issuance costs	$ 1,749	$ 1,651
Interest expense	3,206	3,141
Convertible Senior Notes
Interest expense related to notes
Interest expense	2,137	2,039
Convertible Senior Notes | 1.125% Convertible Senior Notes due 2018
Interest expense related to notes
Interest	388	388
Amortization of discount and debt issuance costs	$ 1,749	$ 1,651
Convertible notes stated interest rate (as a percent)	1.125%		1.125%
Debt Instrument, Interest Rate, Effective Percentage	5.50%	5.50%

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- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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Contractual interest rate for funds borrowed, under the debt agreement.

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

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