CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY, (Unaudited) - USD ($)	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]
Balances at Dec. 31, 2018	$ 336,079,000	$ 491,000	$ 379,975,000	$ (44,387,000)
Increase (Decrease) in Stockholders' Equity
Net income	10,597,000	0	0	10,597,000
Cash dividend declared	(11,822,000)	0	(11,822,000)	0
Issuance of common stock pursuant to public offerings, net	8,503,000	13,000	8,490,000	0
Issuance of common shares pursuant to stock based compensation plan	(6,000)	0	(6,000)	0
Amortization of stock based compensation	87,000	0	87,000	0
Stock Repurchased and Retired During Period, Value	(3,024,000)	(5,000)	(3,019,000)	0
Balances at Mar. 31, 2019	$ 340,414,000	$ 499,000	373,705,000	(33,790,000)
Common Stock Shares Outstanding, Beginning Balance at Dec. 31, 2018	49,132,000	49,132,000
Increase (Decrease) in Stockholders' Equity
Stock Issued During Period Shares New Issues		1,268,000
Stock Issued During Period Shares Share Based Compensation	7,000	7,000
Stock Repurchased and Retired During Period, Shares		(469,000)
Common Stock Shares Outstanding, Ending Balance at Mar. 31, 2019	49,938,000	49,938,000
Balances at Dec. 31, 2018	$ 336,079,000	$ 491,000	379,975,000	(44,387,000)
Increase (Decrease) in Stockholders' Equity
Net income	14,130,000
Balances at Jun. 30, 2019	$ 359,658,000	$ 543,000	389,372,000	(30,257,000)
Common Stock Shares Outstanding, Beginning Balance at Dec. 31, 2018	49,132,000	49,132,000
Common Stock Shares Outstanding, Ending Balance at Jun. 30, 2019		54,283,000
Balances at Dec. 31, 2018	$ 336,079,000	$ 491,000	379,975,000	(44,387,000)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock pursuant to public offerings, net	92,314,000
Balances at Dec. 31, 2019	$ 395,507,000	$ 631,000	414,998,000	(20,122,000)
Common Stock Shares Outstanding, Beginning Balance at Dec. 31, 2018	49,132,000	49,132,000
Increase (Decrease) in Stockholders' Equity
Stock Issued During Period Shares New Issues	14,377,126
Common Stock Shares Outstanding, Ending Balance at Dec. 31, 2019	63,061,781	63,062,000
Balances at Mar. 31, 2019	$ 340,414,000	$ 499,000	373,705,000	(33,790,000)
Increase (Decrease) in Stockholders' Equity
Net income	3,533,000	0	0	3,533,000
Cash dividend declared	(12,859,000)	0	(12,859,000)	0
Issuance of common stock pursuant to public offerings, net	28,495,000	44,000	28,451,000	0
Issuance of common shares pursuant to stock based compensation plan	43,000	0	43,000	0
Amortization of stock based compensation	32,000	0	32,000	0
Balances at Jun. 30, 2019	$ 359,658,000	$ 543,000	389,372,000	(30,257,000)
Common Stock Shares Outstanding, Beginning Balance at Mar. 31, 2019	49,938,000	49,938,000
Increase (Decrease) in Stockholders' Equity
Stock Issued During Period Shares New Issues		4,338,000
Stock Issued During Period Shares Share Based Compensation		7,000
Stock Repurchased and Retired During Period, Shares		0
Common Stock Shares Outstanding, Ending Balance at Jun. 30, 2019		54,283,000
Balances at Dec. 31, 2019	$ 395,507,000	$ 631,000	414,998,000	(20,122,000)
Increase (Decrease) in Stockholders' Equity
Net income	(91,199,000)	0	0	(91,199,000)
Cash dividend declared	(15,670,000)	0	(15,670,000)	0
Issuance of common stock pursuant to public offerings, net	19,447,000	31,000	19,416,000	0
Issuance of common shares pursuant to stock based compensation plan	0	0	0	0
Amortization of stock based compensation	59,000	0	59,000	0
Stock Repurchased and Retired During Period, Value	0	0	0	0
Balances at Mar. 31, 2020	$ 308,144,000	$ 662,000	418,803,000	(111,321,000)
Common Stock Shares Outstanding, Beginning Balance at Dec. 31, 2019	63,061,781	63,062,000
Increase (Decrease) in Stockholders' Equity
Stock Issued During Period Shares New Issues	3,171,000	3,171,000
Stock Issued During Period Shares Share Based Compensation	4,000	4,000
Common Stock Shares Outstanding, Ending Balance at Mar. 31, 2020		66,237,000
Balances at Dec. 31, 2019	$ 395,507,000	$ 631,000	414,998,000	(20,122,000)
Increase (Decrease) in Stockholders' Equity
Net income	(42,427,000)
Issuance of common stock pursuant to public offerings, net	19,447,000
Balances at Jun. 30, 2020	$ 345,968,000	$ 662,000	407,855,000	(62,549,000)
Common Stock Shares Outstanding, Beginning Balance at Dec. 31, 2019	63,061,781	63,062,000
Increase (Decrease) in Stockholders' Equity
Stock Issued During Period Shares New Issues	3,170,727,000
Common Stock Shares Outstanding, Ending Balance at Jun. 30, 2020	66,220,664	66,221,000
Balances at Mar. 31, 2020	$ 308,144,000	$ 662,000	418,803,000	(111,321,000)
Increase (Decrease) in Stockholders' Equity
Net income	48,772,000	0	0	48,772,000
Cash dividend declared	(10,935,000)	0	(10,935,000)	0
Issuance of common stock pursuant to public offerings, net	0	0	0	0
Issuance of common shares pursuant to stock based compensation plan	0	0	0	0
Amortization of stock based compensation	55,000	0	55,000	0
Stock Repurchased and Retired During Period, Value	(68,000)	0	(68,000)	0
Balances at Jun. 30, 2020	$ 345,968,000	$ 662,000	$ 407,855,000	$ (62,549,000)
Common Stock Shares Outstanding, Beginning Balance at Mar. 31, 2020		66,237,000
Increase (Decrease) in Stockholders' Equity
Stock Issued During Period Shares Share Based Compensation		4,000
Stock Repurchased and Retired During Period, Shares		(20,000)
Common Stock Shares Outstanding, Ending Balance at Jun. 30, 2020	66,220,664	66,221,000