Debt - Schedule of Convertible Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Aug. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Convertible Debt [Line Items]
Common stock			$ 8,850
4.50% Senior Exchangeable Notes
Schedule of Convertible Debt [Line Items]
Principal amount of debt			130,973
Unamortized discount			(1,267)
Net carrying amount of debt			$ 129,706
Fixed interest rate	4.50%	4.50%	4.50%	4.50%