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Quarterly Operating Results (Tables)
 12 Months Ended
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
 
Year Ended December 31, 2014
 
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
Total revenues
 
$
125,712

 
$
147,454

 
$
169,676

 
$
155,934

Net income (loss)
 
4,121

 
22,893

 
30,439

 
16,090

Net income (loss) attributable to the Company
 
4,078

 
22,673

 
30,165

 
15,950

Net income (loss) attributable to common shareholders
 
(2,003
)
 
16,591

 
23,737

 
9,462

Net income (loss) per share available to common shareholders, basic and diluted
 
$
(0.03
)
 
$
0.26

 
$
0.36

 
$
0.13

 
 
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2013
 
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
Total revenues
 
$
104,914

 
$
126,301

 
$
131,234

 
$
126,768

Net income (loss)
 
(246
)
 
14,931

 
17,527

 
10,980

Net income (loss) attributable to the Company
 
(248
)
 
14,834

 
17,415

 
10,917

Net income (loss) attributable to common shareholders
 
(4,916
)
 
8,730

 
11,315

 
4,836

Net income (loss) per share available to common shareholders, basic and diluted
 
$
(0.08
)
 
$
0.14

 
$
0.18

 
$
0.08