Debt Debt schedule (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2014
Debt Instrument [Line Items]
Less: current portion	$ 0	$ 10,184
Long-term debt	0	227,394
Convertible Debt [Member] \| 3.25% Convertible Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Unamortized deferred issuance costs			$ (4,200)
Carrying value of equity component, net of issuance costs			$ 30,700
Convertible Debt [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Principal amount of Convertible Senior Notes outstanding	58,503	167,314
Unamortized deferred issuance costs	(3,637)	(15,356)
Net carrying amount of liability component	54,379	149,868
Less: current portion	54,379	0
Long-term debt	0	149,868
Carrying value of equity component, net of issuance costs	10,092	29,211
Fair value of outstanding Convertible Senior Notes	$ 85,999	$ 257,245
Remaining amortization period of discount on the liability component	2 years	3 years
Other Current Assets [Member] \| Convertible Debt [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Unamortized deferred issuance costs	$ (487)	$ (2,090)

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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