Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income	$ 3,202	$ 53,073
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	11,191	11,697
Amortization of operating lease right-of-use assets	6,326	5,706
Amortization of deferred drydocking costs	3,541	2,883
Amortization of debt discount and debt issuance costs	518	562
Gain on sale of vessel	(3,318)	0
Unrealized loss on derivative instruments, net	236	11,450
Stock-based compensation expense	1,855	1,487
Drydocking expenditures	(3,661)	(10,774)
Changes in operating assets and liabilities:
Accounts payable	(833)	3,010
Accounts receivable	2,416	(12,462)
Accrued interest	(1,335)	(1,445)
Inventories	5,168	(10,120)
Operating lease liabilities current and noncurrent	(7,306)	(5,706)
Collateral on derivatives	(2,573)	(6,226)
Fair value of derivatives, other current and noncurrent assets	(133)	(252)
Other accrued liabilities	(4,728)	628
Prepaid expenses	(1,976)	(1,916)
Unearned charter hire revenue	(1,179)	659
Net cash provided by operating activities	7,411	42,254
Cash flows from investing activities:
Purchase of vessels and vessel improvements	(20,881)	(283)
Advances for vessel purchases	(6,020)	0
Purchase of ballast water treatment systems	(210)	(3,494)
Proceeds from hull and machinery insurance claims	174	0
Net proceeds from sale of vessel	8,380	0
Purchase of other fixed assets	(26)	(160)
Net cash used in investing activities	(18,583)	(3,937)
Cash flows from financing activities:
Repayment of long-term debt – Global Ultraco Debt Facility	(12,450)	(12,450)
Dividends paid	(8,626)	(26,818)
Cash paid for taxes related to net share settlement of equity awards	(1,651)	(1,862)
Cash received from exercise of stock options	0	85
Proceeds from equity offerings, net of issuance costs	0	201
Financing costs paid to lenders	0	(18)
Net cash used in financing activities	(22,727)	(40,862)
Net decrease in cash, cash equivalents and restricted cash	(33,899)	(2,545)
Cash, cash equivalents and restricted cash at beginning of period	189,754	86,222
Cash, cash equivalents and restricted cash at end of period	$ 155,855	$ 83,677