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Quarterly Results of Operations (unaudited)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information [Text Block]
Quarterly Results of Operations (unaudited)
The following table summarizes quarterly financial data for the years ended December 31, 2012 and 2011 (in thousands, except per share data):
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
Year ended December 31, 2012
 
 
 
 
 
 
 
 
 
Revenues
$
231,978

 
$
229,824

 
$
229,773

 
$
227,868

 
$
919,443

Income from operations
29,748

 
23,312

 
13,222

 
15,529

 
81,811

Income tax (expense) benefit
(6,953
)
 
(5,997
)
 
(1,461
)
 
(1,943
)
 
(16,354
)
Net income (loss)
14,172

 
9,685

 
2,615

 
3,560

 
30,032

Earnings (loss) per share:
 
 
 
 
 
 
 
 
 
Basic
$
0.23

 
$
0.16

 
$
0.04

 
$
0.06

 
$
0.49

Diluted
$
0.23

 
$
0.15

 
$
0.04

 
$
0.06

 
$
0.48

Year ended December 31, 2011
 
 
 
 
 
 
 
 
 
Revenues
$
153,349

 
$
171,285

 
$
187,651

 
$
203,656

 
$
715,941

Income from operations
5,919

 
11,918

 
19,324

 
20,297

 
57,458

Income tax (expense) benefit
2,102

 
(1,039
)
 
(5,250
)
 
(5,469
)
 
(9,656
)
Net income (loss)
(6,035
)
 
3,650

 
6,744

 
6,818

 
11,177

Earnings (loss) per share:
 
 
 
 
 
 
 
 
 
Basic
$
(0.11
)
 
$
0.07

 
$
0.11

 
$
0.11

 
$
0.19

Diluted
$
(0.11
)
 
$
0.07

 
$
0.11

 
$
0.11

 
$
0.19