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Convertible Notes (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Interest expense related to notes
Amortization of discount and debt issuance costs	$ 2,680	$ 1,749
Interest expense	4,421	3,206
1.125% Convertible Senior Notes due 2018
Interest expense related to notes
Interest	53	388
Amortization of discount and debt issuance costs	1,090	1,749
Interest expense	$ 3,326	$ 2,137
Convertible Notes Payable [Member] | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member]
Interest expense related to notes
Convertible notes stated interest rate (as a percent)	1.375%		1.375%
Debt Instrument, Interest Rate, Effective Percentage	4.90%
Convertible Notes Payable [Member] | 1.125% Convertible Senior Notes due 2018
Interest expense related to notes
Debt Instrument, Interest Rate, Effective Percentage		5.50%
Convertible Senior Notes | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member]
Interest expense related to notes
Interest	$ 593	$ 0
Amortization of discount and debt issuance costs	$ 1,590	$ 0
Convertible Notes Payable [Member] | 1.125% Convertible Senior Notes due 2018
Interest expense related to notes
Convertible notes stated interest rate (as a percent)	1.125%	1.125%	1.125%
Debt Instrument, Interest Rate, Effective Percentage	5.50%

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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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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