Debt (Tables)

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Company's Borrowings

The Company’s debt is as follows:

	March 31, 2017		December 31, 2016
4.00% Convertible Senior Notes, $152,000 face amount, due in June 2036	$	114,142	$	113,446
2.75% Convertible Senior Notes, $73,838 face amount, due in June 2019	67,896		67,254
REG Danville term loan, secured, variable interest rate of LIBOR plus 4%, due in December 2017	7,525		8,163
REG Newton term loan, secured, variable interest rate of LIBOR plus 4%, due in December 2018	12,329		13,063
REG Mason City term loan, fixed interest rate of 5%, due in July 2019	2,416		2,659
REG Ames term loans, secured, fixed interest rates of 3.5% and 4.25%, due in January 2018 and December 2019, respectively	3,479		3,565
REG Grays Harbor term loan, variable interest of minimum of 3.5% or Prime Rate plus 0.25%, due in May 2022	8,815		9,273
Other	449		468
Total term debt before debt issuance costs	217,051		217,891
Less: Current portion of long-term debt	17,366		15,402
Less: Debt issuance costs (net of accumulated amortization of $3,928 and $3,705, respectively)	6,065		6,286
Total long-term debt	$	193,620	$	196,203

Revolving Line of Credit

Lines of Credit

	March 31, 2017		December 31, 2016
Amount outstanding under lines of credit	$	22,562	$	52,844
Maximum available to be borrowed under lines of credit	$	69,714	$	100,237