Debt Obligations (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Schedule of notes payable

Debt obligations consisted of the following:

	As of December 31,
	2019			2018
	(in thousands)
Credit facility at a floating rate of interest of one-month LIBOR plus 1.375% at December 31, 2019, secured by engines. The facility has a committed amount of $1.0 billion at December 31, 2019, which revolves until the maturity date of June 2024	$	397,000		$	427,000
WEST IV Series A 2018 term notes payable at a fixed rate of interest of 4.75%, maturing in September 2043, secured by engines	307,014			323,075
WEST IV Series B 2018 term notes payable at a fixed rate of interest of 5.44%, maturing in September 2043, secured by engines	43,859			46,154
WEST III Series A 2017 term notes payable at a fixed rate of interest of 4.69%, maturing in August 2042, secured by engines	257,754			274,205
WEST III Series B 2017 term notes payable at a fixed rate of interest of 6.36%, maturing in August 2042, secured by engines	36,860			39,212
WEST II Series A 2012 term notes payable at a fixed rate of interest of 5.50%, maturing in September 2037, secured by engines	211,572			237,847
Note payable at three-month LIBOR plus a margin ranging from 1.85% to 2.50% at December 31, 2019, maturing in July 2022, secured by engines	7,286			—
Note payable at fixed rate of interest of 3.18%, maturing in July 2024, secured by an aircraft	9,124			10,937
	1,270,469			1,358,430
Less: unamortized debt issuance costs	(19,463		)	(21,081		)
Total debt obligations	$	1,251,006		$	1,337,349

Schedule or principal outstanding

Principal outstanding at December 31, 2019, is expected to be repayable as follows:

Year	(in thousands)
2020	$	56,118
2021	56,415
2022 (includes $158.4 million outstanding on WEST II Series A 2012 term note)	207,994
2023	34,018
2024 (includes $397.0 million outstanding on revolving credit facility)	430,185
Thereafter	485,739
Total	$	1,270,469