Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income	$ 147,527	$ 19,074
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	23,573	21,538
Amortization of operating lease right-of-use assets	12,664	6,201
Amortization of deferred drydocking costs	6,261	4,079
Amortization of debt discount and debt issuance costs	1,092	3,467
Net unrealized (gain)/loss on fair value of derivatives	(1,393)	30,541
Stock-based compensation expense	3,092	1,458
Drydocking expenditures	(16,098)	(6,429)
Changes in operating assets and liabilities:
Accounts payable	1,793	8,216
Accounts receivable	(15,492)	(10,390)
Accrued interest	51	(131)
Inventories	(7,542)	(4,274)
Operating lease liabilities current and noncurrent	(12,664)	(6,664)
Collateral on derivatives	(1,689)	(33,499)
Fair value of derivatives, other current and noncurrent assets	(453)	(41)
Other accrued liabilities	(868)	(1,779)
Prepaid expenses	(1,162)	(1,112)
Unearned charter hire revenue	1,522	330
Net cash provided by operating activities	140,214	30,585
Cash flows from investing activities:
Purchase of vessels and vessel improvements	(495)	(79,002)
Advances for vessel purchases	0	(5,340)
Purchase of scrubbers and ballast water systems	(4,807)	(2,385)
Proceeds from hull and machinery insurance claims	0	238
Purchase of other fixed assets	(241)	(14)
Net cash used in investing activities	(5,543)	(86,503)
Cash flows from financing activities:
Proceeds from issuance of shares under ATM Offering, net of commissions	0	27,372
Cash received from exercise of stock options	85	22
Cash used to settle net share equity awards	(1,915)	(986)
Equity offerings issuance costs	201	(292)
Financing costs paid to lenders	(18)	(351)
Dividends paid	(52,816)	0
Net cash (used in)/provided by financing activities	(79,363)	50,868
Net increase/(decrease) in cash, cash equivalents and restricted cash	55,308	(5,050)
Cash, cash equivalents and restricted cash at beginning of period	86,222	88,849
Cash, cash equivalents and restricted cash at end of period	141,530	83,799
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid during the period for interest	7,123	13,420
Accruals for vessel purchases and vessel improvements included in Other accrued liabilities	6	229
Accruals for scrubbers and ballast water treatment systems included in Accounts payable and Other accrued liabilities	3,010	3,346
Accruals for dividends payable included in Other accrued liabilities and Other noncurrent accrued liabilities	1,237	0
Accrual for issuance costs for ATM Offering included in Other accrued liabilities	0	89
Accruals for debt issuance costs included in Accounts payable and Other accrued liabilities	0	500
New Ultraco Debt Facility
Cash flows from financing activities:
Proceeds from debt	0	11,000
New Ultraco Debt Facility | Term Loan
Cash flows from financing activities:
Repayments of long-term debt	0	(15,897)
New Ultraco Debt Facility | Revolver Loan
Cash flows from financing activities:
Proceeds from debt	0	55,000
Norwegian Bond Debt Facility
Cash flows from financing activities:
Repayments of long-term debt	0	(4,000)
New Ultraco Revolver Facility | Revolver Loan
Cash flows from financing activities:
Repayments of long-term debt	0	(30,000)
Super Senior Facility | Revolver Loan
Cash flows from financing activities:
Repayments of long-term debt	0	(15,000)
Holdco Revolving Credit Facility | Revolver Loan
Cash flows from financing activities:
Proceeds from debt	0	24,000
Global Ultraco Debt Facility | Revolver Loan
Cash flows from financing activities:
Repayments of long-term debt	$ (24,900)	$ 0