Deferred revenue (Tables)

12 Months Ended

Dec. 31, 2015

Deferred Revenue Disclosure [Abstract]

Deferred Revenue

	2015			2014
Deferred revenue on time charters	$	14,271		$	21,889
Deferred interest on lease receivable		1,428			4,143
Other deferred revenue		9,230			8,982
Deferred revenue		24,929			35,014
Current portion		(22,199	)		(27,671	)
Deferred revenue	$	2,730		$	7,343