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Summary of Quarterly Results (Tables)
 12 Months Ended
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
1st
Quarter
 
2nd
Quarter
 
3rd
Quarter
 
4th
Quarter (a)
2013
 
 
 
 
 
 
 
Total revenue
$
139,554

 
$
140,644

 
$
143,354

 
$
138,658

Net income (loss)
3,919

 
7,180

 
11,088

 
21,002

Net income (loss) allocated to Common Shares
2,058

 
5,308

 
9,173

 
18,975

Basic earnings (loss) per Common Share
$
0.01

 
$
0.03

 
$
0.06

 
$
0.12

Diluted earnings (loss) per Common Share
$
0.01

 
$
0.03

 
$
0.06

 
$
0.12

2012
 
 
 
 
 
 
 
Total revenue
$
133,516

 
$
131,530

 
$
134,238

 
$
136,395

Net income (loss)
9,336

 
6,802

 
17,089

 
(26,698
)
Net income (loss) allocated to Common Shares
7,108

 
1,537

 
13,949

 
(30,832
)
Basic earnings (loss) per Common Share
$
0.05

 
$
0.01

 
$
0.10

 
$
(0.21
)
Diluted earnings (loss) per Common Share
$
0.05

 
$
0.01

 
$
0.10

 
$
(0.21
)