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Summarized Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
Summarized Quarterly Financial Data [Abstract]  
Schedule of quarterly financial information
Quarter
 
2012
 
First
 
 
Second
 
 
Third
 
 
Fourth
 
Revenues
 
$
149,532
 
 
$
146,254
 
 
$
124,260
 
 
$
141,933
 
Income from operations
 
 
40,858
 
 
 
36,168
 
 
 
7,836
 
 
 
28,725
 
Net income
 
 
23,989
 
 
 
21,212
 
 
 
4,103
 
 
 
16,627
 
Net income per share:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
 
$
2.10
 
 
$
1.86
 
 
$
0.36
 
 
$
1.47
 
Diluted
 
$
2.09
 
 
$
1.85
 
 
$
0.36
 
 
$
1.47
 
 
 
 
Quarter
 
2013
 
First
 
 
Second
 
 
Third
 
 
Fourth
 
Revenues
 
$
137,506
 
 
$
131,980
  
 
$
110,031
 
 
$
124,083
 
Income (loss) from operations
 
 
29,919
 
 
 
26,257
  
 
 
6,621
 
 
 
(30,096
)
Net income (loss)
 
 
17,231
 
 
 
15,002
  
 
 
3,149
 
 
 
(18,957
)
Net income (loss) per share:
 
 
  
 
 
 
    
 
 
  
 
 
 
  
 
Basic
 
$
1.59
 
 
$
1.43
  
 
$
.30
 
 
$
(1.80
)
Diluted
 
$
1.59
 
 
$
1.42
  
 
$
.30
 
 
$
(1.80
)