Debt (Tables)

6 Months Ended

Jun. 30, 2016

Debt Disclosure [Abstract]

Company's Borrowings

The Company’s debt is as follows:

	June 30, 2016		December 31, 2015
4.00% Convertible Senior Notes, $152,000 face amount, due in June 2036	$	112,068	$	—
2.75% Convertible Senior Notes, $79,838 face amount, due in June 2019	71,351		126,053
REG Geismar GOZone bonds, secured, variable interest rate of daily LIBOR, due in October 2033	100,000		100,000
REG Danville term loan, secured, variable interest rate of LIBOR plus 4%, due in December 2017	9,413		—
REG Newton term loan, secured, variable interest rate of LIBOR plus 4%, due in December 2018	14,921		16,800
REG Mason City term loan, fixed interest rate of 5%, due in July 2019	3,213		3,675
REG Ames term loans, secured, fixed interest rates of 3.5% and 4.25%, due in January 2018 and December 2019, respectively	3,735		3,901
REG Grays Harbor term loan, variable interest of minimum of 3.5% or Prime Rate plus 0.25%, due in May 2022	5,225		5,225
Other	988		908
Total term debt before debt issuance costs	320,914		256,562
Less: Current portion of long-term debt	7,959		5,206
Less: Debt issuance costs (net of accumulated amortization of $2,805 and $2,296, respectively	6,748		4,105
Total long-term debt	$	306,207	$	247,251

Revolving Line of Credit

Lines of Credit

	June 30, 2016		December 31, 2015
Amount outstanding under lines of credit	$	48,603	$	23,149
Maximum available to be borrowed under lines of credit	$	9,661	$	23,067