Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ 34,022	$ (138,554)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	27,209	33,504
Amortization of deferred financing costs	2,235	1,909
Right-of-use asset amortization	690	676
Amortization of nonvested stock compensation expense	1,073	957
Impairment of vessel assets	0	112,814
Loss on sale of vessels	735	486
Amortization of premium on derivative	111
Interest rate cap premium payment	(240)
Insurance proceeds for protection and indemnity claims	101	278
Insurance proceeds for loss of hire claims		78
Change in assets and liabilities:
(Increase) decrease in due from charterers	(921)	331
(Increase) decrease in prepaid expenses and other current assets	(894)	504
(Increase) decrease in inventories	(4,858)	4,174
Increase (decrease) in accounts payable and accrued expenses	5,028	(17,454)
Increase (decrease) in deferred revenue	954	(2,259)
Decrease in operating lease liabilities	(871)	(828)
Deferred drydock costs incurred	(1,822)	(5,593)
Net cash provided by (used in) operating activities	62,552	(8,977)
Cash flows from investing activities:
Purchase of vessels and ballast water treatment systems, including deposits	(24,678)	(2,275)
Purchase of scrubbers (capitalized in Vessels)	(126)	(10,839)
Purchase of other fixed assets	(431)	(2,716)
Net proceeds from sale of vessels	29,096	14,726
Insurance proceeds for hull and machinery claims	295	484
Net cash provided by (used in) investing activities	4,156	(620)
Cash flows from financing activities:
Cash dividends paid	(2,983)	(8,126)
Payment of deferred financing costs		(283)
Net cash used in financing activities	(85,186)	(9,760)
Net decrease in cash, cash equivalents and restricted cash	(18,478)	(19,357)
Cash, cash equivalents and restricted cash at beginning of period	179,679	162,249
Cash, cash equivalents and restricted cash at end of period	161,201	142,892
Secured Debt | $133 Million Credit Facility
Cash flows from financing activities:
Proceeds from credit facility		24,000
Repayment of secured debt	(24,320)	(3,280)
Secured Debt | $495 Million Credit Facility
Cash flows from financing activities:
Proceeds from credit facility		11,250
Repayment of secured debt	$ (57,883)	$ (33,321)