Commitments and contingent obligations (Tables)

12 Months Ended

Dec. 31, 2015

Commitments And Contingencies Disclosure [Abstract]

Schedule of Future Minimum Revenues to be Received on Committed Agreements

(a) As of December 31, 2015, the minimum future revenues to be received on committed time charter party agreements and interest income from sales-type capital leases are approximately:

2016	$	869,010
2017		805,062
2018		794,182
2019		765,268
2020		724,742
Thereafter		1,981,112
	$	5,939,376

Schedule of Outstanding Commitments for Installment Payments for Vessels

(b) As of December 31, 2015, based on the contractual delivery dates, the Company has outstanding commitments for installment payments for vessels under construction as follows:

2016	$	373,247
2017		293,900
	$	667,147

Schedule of Commitment Under Operating Leases

(c) As of December 31, 2015, the commitment under operating leases for vessels is $821,684,000 for 2016 to 2027 and office space is $5,442,000 for 2016 to 2019.  Total commitments under these leases are as follows:

2016	$	76,993
2017		77,932
2018		78,180
2019		78,415
2020		79,130
Thereafter		436,476
	$	827,126