Deferred revenue (Tables)

12 Months Ended

Dec. 31, 2016

Deferred Revenue Disclosure [Abstract]

Deferred Revenue

	2016			2015
Deferred revenue on time charters	$	26,879		$	14,271
Deferred interest on lease receivable		—			1,428
Other deferred revenue		2,828			9,230
Deferred revenue		29,707			24,929
Current portion		(28,179	)		(22,199	)
Deferred revenue	$	1,528		$	2,730