Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Warrant Issued For Vessel Consideration	Cumulative Effect, Period of Adoption, Adjustment	Common stock	Common stock Warrant Issued For Vessel Consideration	Additional paid-in capital	Additional paid-in capital Warrant Issued For Vessel Consideration	Additional paid-in capital Cumulative Effect, Period of Adoption, Adjustment	Accumulated deficit	Accumulated deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated other comprehensive income
Beginning balance (in shares) at Dec. 31, 2020				11,661,797
Beginning balance at Dec. 31, 2020	$ 470,418			$ 116		$ 943,572			$ (472,138)		$ (1,132)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,849								9,849
Issuance of shares due to vesting of restricted shares (in shares)				71,146
Issuance of shares due to vesting of restricted shares	0			$ 1		(1)
Net unrealized gain on cash flow hedges	600										600
Fees for equity offerings	(32)					(32)
Cash used to settle net share equity awards	(811)					(811)
Stock-based compensation	872					872
Ending balance (in shares) at Mar. 31, 2021				11,732,943
Ending balance at Mar. 31, 2021	480,896			$ 117		943,600			(462,289)		(532)
Beginning balance (in shares) at Dec. 31, 2020				11,661,797
Beginning balance at Dec. 31, 2020	470,418			$ 116		943,572			(472,138)		(1,132)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	97,416
Net unrealized gain on cash flow hedges	724
Ending balance (in shares) at Sep. 30, 2021				12,863,998
Ending balance at Sep. 30, 2021	607,649			$ 128		982,652			(374,723)		(408)
Beginning balance (in shares) at Dec. 31, 2020				11,661,797
Beginning balance at Dec. 31, 2020	$ 470,418			$ 116		943,572			(472,138)		(1,132)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-06
Ending balance (in shares) at Dec. 31, 2021				12,917,027
Ending balance at Dec. 31, 2021	$ 671,266		$ (12,050)	$ 129		982,746		$ (20,726)	(313,495)	$ 8,676	1,886
Beginning balance (in shares) at Mar. 31, 2021				11,732,943
Beginning balance at Mar. 31, 2021	480,896			$ 117		943,600			(462,289)		(532)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,225								9,225
Issuance of shares due to vesting of restricted shares (in shares)				2,773
Issuance of shares upon conversion of warrants (in shares)					432,037
Issuance of shares upon conversion of warrants		$ 8,375			$ 4		$ 8,371
Issuance of shares from ATM Offering, net of commissions and issuance costs (in shares)				581,385
Issuance of shares from ATM Offering, net of commissions and issuance costs	27,284			$ 6		27,278
Issuance of shares upon exercise of stock options (in shares)				4,117
Issuance of shares upon exercise of stock options	22					22
Net unrealized gain on cash flow hedges	44										44
Cash used to settle net share equity awards	(174)					(174)
Stock-based compensation	586					586
Ending balance (in shares) at Jun. 30, 2021				12,753,255
Ending balance at Jun. 30, 2021	526,258			$ 127		979,683			(453,064)		(488)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	78,341								78,341
Issuance of shares upon conversion of warrants (in shares)				25	109,861
Issuance of shares upon conversion of warrants	1	$ 2,305			$ 1	1	$ 2,304
Issuance of shares upon exercise of stock options (in shares)				857
Issuance of shares upon exercise of stock options	33					33
Net unrealized gain on cash flow hedges	80										80
Cash used to settle net share equity awards	(146)					(146)
Stock-based compensation	777					777
Ending balance (in shares) at Sep. 30, 2021				12,863,998
Ending balance at Sep. 30, 2021	607,649			$ 128		982,652			(374,723)		(408)
Beginning balance (in shares) at Dec. 31, 2021				12,917,027
Beginning balance at Dec. 31, 2021	671,266		(12,050)	$ 129		982,746		(20,726)	(313,495)	8,676	1,886
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 53,073								53,073
Cash dividend declared (in dollars per share)	$ 2.05
Dividends	$ (27,112)								(27,112)
Issuance of shares due to vesting of restricted shares (in shares)				60,890
Issuance of shares due to vesting of restricted shares	0			$ 1		(1)
Issuance of shares upon exercise of stock options (in shares)				8,077
Issuance of shares upon exercise of stock options	85					85
Net unrealized gain on cash flow hedges	8,681										8,681
Fees for equity offerings	201					201
Cash used to settle net share equity awards	(1,862)					(1,862)
Stock-based compensation	1,487					1,487
Ending balance (in shares) at Mar. 31, 2022				12,985,994
Ending balance at Mar. 31, 2022	693,769			$ 130		961,930			(278,858)		10,567
Beginning balance (in shares) at Dec. 31, 2021				12,917,027
Beginning balance at Dec. 31, 2021	671,266		$ (12,050)	$ 129		982,746		$ (20,726)	(313,495)	$ 8,676	1,886
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	224,743
Net unrealized gain on cash flow hedges	15,405
Ending balance (in shares) at Sep. 30, 2022				13,003,516
Ending balance at Sep. 30, 2022	819,203			$ 130		964,494			(162,712)		17,291
Beginning balance (in shares) at Mar. 31, 2022				12,985,994
Beginning balance at Mar. 31, 2022	693,769			$ 130		961,930			(278,858)		10,567
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 94,453								94,453
Cash dividend declared (in dollars per share)	$ 2.00
Dividends	$ (26,449)								(26,449)
Issuance of shares due to vesting of restricted shares (in shares)				3,187
Net unrealized gain on cash flow hedges	2,170										2,170
Cash used to settle net share equity awards	(53)					(53)
Stock-based compensation	1,605					1,605
Ending balance (in shares) at Jun. 30, 2022				12,989,181
Ending balance at Jun. 30, 2022	765,495			$ 130		963,482			(210,854)		12,737
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 77,217								77,217
Cash dividend declared (in dollars per share)	$ 2.20
Dividends	$ (29,075)								(29,075)
Issuance of shares due to vesting of restricted shares (in shares)				14,335
Net unrealized gain on cash flow hedges	4,554										4,554
Cash used to settle net share equity awards	(437)					(437)
Stock-based compensation	1,449					1,449
Ending balance (in shares) at Sep. 30, 2022				13,003,516
Ending balance at Sep. 30, 2022	$ 819,203			$ 130		$ 964,494			$ (162,712)		$ 17,291