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Convertible Notes (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Interest expense related to notes
Amortization of discount and debt issuance costs			$ 5,396	$ 3,523
Interest expense	$ 4,634	$ 3,261	9,055	6,467
1.125% Convertible Senior Notes due 2018
Interest expense related to notes
Interest	228	388	281	776
Amortization of discount and debt issuance costs	1,106	1,774	2,197	3,523
Interest expense	$ 3,537	$ 2,162	$ 6,863	$ 4,299
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%		1.375%
Debt Instrument, Interest Rate, Effective Percentage	4.90%		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%		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	$ 1,186	$ 0
Amortization of discount and debt issuance costs	$ 1,610	$ 0	$ 3,199	$ 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%	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
-Topic 230
-SubTopic 10
-Section 45
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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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-Publisher FASB
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Contractual interest rate for funds borrowed, under the debt agreement.

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