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Fair value measurements and Hedging - Fair value on a recurring basis - Significant Other Observable Inputs (Table) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
ASSETS
asset position	$ 0	$ 537
Significant Other Observable Inputs (Level 2) | Designated as cash flow hedges
ASSETS
Total	0	0
LIABILITIES
Total	0	0
Significant Other Observable Inputs (Level 2) | Not designated as cash flow hedges
ASSETS
Total	0	537
LIABILITIES
Total	2,398	1,799
Forward freight agreements | Significant Other Observable Inputs (Level 2) | Not designated as cash flow hedges
ASSETS
asset position		537
LIABILITIES
liability position	1,902
Bunker swaps | Significant Other Observable Inputs (Level 2) | Not designated as cash flow hedges
LIABILITIES
liability position	$ 496	$ 1,799

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Fair value as of the balance sheet date of forward freight agreements derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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