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Earnings Per Share Level 3 (Tables)
 9 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2012
 
2011
 
2012
 
2011
 
 
(Dollars in thousands, except per share data)
Numerator:
 
 
 
 
 
 
 
 
Net income (loss) - numerator for earnings per common share
 
$
(7,829
)
 
$
(13,068
)
 
$
21,401

 
$
36,549

Interest on convertible subordinated debentures (net of income tax benefit)
 
2

 
258

 
517

 
775

Numerator for earnings (loss) per common share - assuming dilution
 
$
(7,827
)
 
$
(12,810
)
 
$
21,918

 
$
37,324

 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
 
Weighted average common shares outstanding (1)
 
62,504,421

 
59,595,846

 
60,722,625

 
59,428,844

Effect of dilutive securities:
 
 
 
 
 
 
 
 
Convertible subordinated debentures
 
65,688

 
2,727,084

 
1,801,211

 
2,727,084

Convertible senior notes
 
2,145,940

 
—

 
2,145,940

 
—

Stock options and deferred compensation agreements
 
545,877

 
375,497

 
562,309

 
627,347

Denominator for earnings (loss) per common share - assuming dilution
 
65,261,926

 
62,698,427

 
65,232,085

 
62,783,275

 
 
 
 
 
 
 
 
 
Earnings (loss) per common share
 
$
(0.13
)
 
$
(0.22
)
 
$
0.35

 
$
0.62

Earnings (loss) per common share - assuming dilution
 
$
(0.13
)
 
$
(0.22
)
 
$
0.34

 
$
0.59
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
Period
 
Number of
Shares
 
Range of
Exercise Prices
 
 
 
 
Minimum
 
Maximum
Three months ended September 30, 2012
 
1,498,100

 
$11.88
 
$14.34
Nine months ended September 30, 2012
 
1,502,100

 
$11.35
 
$14.34
Three months ended September 30, 2011
 
2,296,600

 
$10.65
 
$14.34
Nine months ended September 30, 2011
 
2,296,600

 
$10.65
 
$14.34