Consolidated Statement of Stockholders' Equity - USD ($)	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]
Balances at Dec. 31, 2013	$ 44,765,000	$ 33,000	$ 46,116,000	$ (1,384,000)
Increase (Decrease) in Stockholders' Equity
Net loss	24,519,000	0	0	24,519,000
Cash dividend declared	(22,643,000)	0	0	(22,643,000)
Stock Issued During Period, Value, New Issues	171,295,000	134,000	171,161,000	0
Issuance of common shares pursuant to equity compensation plan	77,000	0	77,000	0
Amortization of equity plan compensation	65,000	0	65,000	0
Balances at Dec. 31, 2014	218,078,000	167,000	217,419,000	492,000
Increase (Decrease) in Stockholders' Equity
Net loss	1,071,000	0	0	1,071,000
Cash dividend declared	(38,748,000)	0	(37,185,000)	(1,563,000)
Stock Issued During Period, Value, New Issues	83,275,000	62,000	83,213,000	0
Issuance of common shares pursuant to equity compensation plan	287,000	0	287,000	0
Amortization of equity plan compensation	144,000	0	144,000	0
Shares repurchased and retired, cost	(10,852,000)	(12,000)	(10,840,000)	0
Balances at Dec. 31, 2015	253,255,000	217,000	253,038,000	0
Increase (Decrease) in Stockholders' Equity
Net loss	1,979,000	0	0	1,979,000
Cash dividend declared	(41,388,000)	0	(39,409,000)	(1,979,000)
Stock Issued During Period, Value, New Issues	118,328,000	113,000	118,215,000	0
Issuance of common shares pursuant to equity compensation plan	301,000	0	301,000	0
Amortization of equity plan compensation	304,000	0	304,000	0
Balances at Dec. 31, 2016	$ 332,779,000	$ 330,000	$ 332,449,000	$ 0