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COMMON STOCK ACTIVITY (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Common Stock Activity
The following table presents the common stock activity for the three years ended December 31, 2018:
 
Years Ended December 31,
2018
 
2017
 
2016
Common Stock (in shares)
Shares outstanding at beginning of year
34,758,167

 
33,332,213

 
32,421,460

Common stock offerings                                                            
1,706,474

 
1,370,457

 
875,052

Dividend reinvestment plan                                                            
1,844

 
2,744

 
3,326

Incentive restricted stock granted                                                            
50,217

 
93,285

 
80,529

Incentive restricted stock forfeited                                                            
—

 
(16,000
)
 
(910
)
Director common stock awarded                                                            
8,478

 
8,881

 
10,072

Director restricted stock granted
—

 
282

 
—

Restricted stock withheld for tax obligations
(23,824
)
 
(33,695
)
 
(57,316
)
Shares outstanding at end of year                                                            
36,501,356

 
34,758,167

 
33,332,213
Common Stock Issuances Table [Table Text Block]
The following table presents the common stock issuance activity for the three years ended December 31, 2018:
Years Ended December 31,
 
Number of Shares of
Common Stock Issued
 
Net Proceeds
 
 
 
 
(In thousands)
2018
 
1,706,474

 
$
157,319

2017
 
1,370,457

 
109,207

2016
 
875,052

 
59,283