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Debt - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Long-term debt
Amortization of debt issuance costs			$ 185	$ 147
Convertible debt | 3.00% Convertible senior notes due 2022
Long-term debt
Contractual interest expense	$ 1,131	$ 1,125	2,241	2,241
Amortization of debt issuance costs	83	75	163	147
Amortization of debt discount	1,674	1,495	3,274	2,941
Total	$ 2,888	$ 2,695	$ 5,678	$ 5,329
Effective interest rate of the liability component	11.00%	11.00%	11.00%	11.00%

X

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

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Amount of amortization expense attributable to debt issuance costs.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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- Definition

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

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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