Stockholders' Equity and Employee Stock Option Plans Exercise Price ranges and related information for options and SARS (Tables)
 12 Months Ended
Dec. 31, 2013
Exercise Price ranges and related information for options and SARS [Abstract]  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
The following table provides additional information for significant ranges of outstanding and exercisable stock options and SARs as of December 31, 2013:

Exercise
Price Range
 
Number
Outstanding
 
Weighted
Average
Remaining
Contractual Life
(in years)
 
 Weighted
Average
Exercise
Price per Share
 
 
Aggregate Intrinsic Value
2.11-2.29
 
419,600

 
9.68
 
$
2.19

 
$
4,640

2.37
 
1,183,829

 
9.44
 
2.37

 
—

2.51-2.57
 
92,500

 
9.30
 
2.55

 
—

3.17
 
1,217,567

 
8.37
 
3.17

 
—

3.40-7.46
 
513,725

 
4.23
 
6.02

 
—

7.47-8.20
 
431,978

 
0.47
 
7.55

 
—

9.08-10.62
 
123,900

 
2.36
 
9.99

 
—

12.11
 
40,000

 
0.69
 
12.11

 
—

12.82
 
75,000

 
0.86
 
12.82

 
—

13.85
 
6,750

 
0.78
 
13.85

 
—

Outstanding
 
4,104,849

 
7.08
 
$
4.13

 
$
4,640

Vested and expected to vest
 
3,918,854

 
7.06
 
$
4.20

 
$
4,212

Exercisable
 
1,348,270

 
3.64
 
$
6.60

 
$
—