CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY, (Unaudited) - USD ($)	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]
Balances at Dec. 31, 2015	$ 253,255,000	$ 217,000	$ 253,038,000	$ 0
Increase (Decrease) in Stockholders' Equity
Net income	1,979,000	0	0	1,979,000
Cash dividend declared	(41,388,000)	0	(39,409,000)	(1,979,000)
Issuance of common stock pursuant to public offerings, net	118,328,000	113,000	118,215,000	0
Issuance of common shares pursuant to stock based compensation plan	301,000	0	301,000	0
Amortization of stock based compensation	304,000	0	304,000	0
Balances at Dec. 31, 2016	332,779,000	330,000	332,449,000	0
Increase (Decrease) in Stockholders' Equity
Net income	2,007,000	0	0	2,007,000
Cash dividend declared	(70,717,000)	0	(68,710,000)	(2,007,000)
Issuance of common stock pursuant to public offerings, net	197,607,000	200,000	197,407,000	0
Issuance of common shares pursuant to stock based compensation plan	262,000	1,000	261,000	0
Amortization of stock based compensation	273,000	0	273,000	0
Balances at Dec. 31, 2017	462,211,000	531,000	461,680,000	0
Increase (Decrease) in Stockholders' Equity
Net income	(44,387,000)	0	0	(44,387,000)
Cash dividend declared	55,814,000	0	55,814,000	0
Issuance of common shares pursuant to stock based compensation plan	293,000	0	293,000	0
Amortization of stock based compensation	199,000	0	199,000	0
Stock Repurchased and Retired During Period, Value	(26,423,000)	(40,000)	(26,383,000)	0
Balances at Dec. 31, 2018	$ 336,079,000	$ 491,000	$ 379,975,000	$ (44,387,000)