Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 83,602,000	$ 86,147,000
Accounts receivable, net of a reserve of $1,837 and $1,818, respectively	40,918,000	28,456,000
Prepaid expenses	5,278,000	3,362,000
Inventories	27,771,000	17,651,000
Collateral on derivatives	21,307,000	15,081,000
Fair value of derivative assets - current	5,516,000	4,669,000
Other current assets	797,000	667,000
Total current assets	185,189,000	156,033,000
Noncurrent assets:
Vessels and vessel improvements, at cost, net of accumulated depreciation of $230,318 and $218,670, respectively	900,920,000	908,076,000
Operating lease right-of-use assets	18,654,000	17,017,000
Other fixed assets, net of accumulated depreciation of $1,452 and $1,403, respectively	368,000	257,000
Restricted cash - noncurrent	75,000	75,000
Deferred drydock costs, net	44,985,000	37,093,000
Fair value of derivative assets - noncurrent	8,476,000	3,112,000
Advances for ballast water systems and other assets	3,920,000	4,995,000
Total noncurrent assets	977,398,000	970,625,000
Total assets	1,162,587,000	1,126,658,000
Current liabilities:
Accounts payable	23,396,000	20,781,000
Accrued interest	1,512,000	2,957,000
Other accrued liabilities	18,815,000	17,994,000
Fair value of derivative liabilities - current	13,111,000	4,253,000
Lease liabilities - short term	15,749,000	15,728,000
Unearned charter hire revenue	12,746,000	12,088,000
Current portion of long-term debt	49,800,000	49,800,000
Total current liabilities	135,129,000	123,601,000
Noncurrent liabilities:
Total debt	330,395,000	330,244,000
Lease liabilities - long term	2,899,000	1,282,000
Other noncurrent accrued liabilities	395,000	265,000
Total noncurrent liabilities	333,689,000	331,791,000
Total liabilities	468,818,000	455,392,000
Commitments and contingencies
Stockholders' equity:
Preferred stock	0	0
Common stock	130,000	129,000
Additional paid-in capital	961,930,000	982,746,000
Accumulated deficit	(278,858,000)	(313,495,000)
Accumulated other comprehensive income	10,567,000	1,886,000
Total stockholders' equity	693,769,000	671,266,000
Total liabilities and stockholders' equity	1,162,587,000	1,126,658,000
Ultraco Global Debt Facility
Noncurrent liabilities:
Total debt	217,245,000	229,290,000
Convertible Bond Debt
Noncurrent liabilities:
Total debt	$ 113,150,000	$ 100,954,000