Leases (Tables)

12 Months Ended

Dec. 31, 2015

Leases, Operating [Abstract]

Rental Expense Under Non-Cancelable Revenue Equipment Operating Leases

Rental expense under these non-cancelable revenue equipment operating leases for the years ended December 31, 2015, 2014, and 2013 was as follows (in thousands):

2015	$	584
2014	1,565
2013	1,593