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Debt Debt (Tables)
12 Months Ended
Dec. 31, 2011
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
(Dollars in thousands)
 
 
2011

 
2010

Revenue bonds, fixed rate 5.9% to 7.75%, due 2012 through 2026
$
149,745

 
$
149,712

7.5% Senior Notes, due 2019
147,984

 
147,726

Debentures, 6.95%, due 2015
22,490

 
22,488

Medium-term notes, fixed rate 8.75% to 8.89%, due 2012 through 2022
43,750

 
48,750

Interest rate swaps
2,409

 
(216
)
Other notes
25

 
36

 
366,403

 
368,496

Less current installments on long-term debt
21,661

 
5,011

Long-term debt
$
344,742

 
$
363,485

Schedule of Covenant Compliance [Table Text Block]
The table below sets forth the most restrictive covenants in the bank credit facility and our status with respect to these covenants as of December 31, 2011:
 
 
 
 
 
 
 
 
  
COVENANT
 REQUIREMENT
ACTUAL RATIO AT
DECEMBER 31, 2011
Minimum Interest Coverage Ratio
2.00

to
1.00
3.95

to
1.00
Minimum Collateral Coverage Ratio
3.00

to
1.00
3.27

to
1.00
Maximum Funded Indebtedness to Capitalization Ratio
70.0%
56.4%
Minimum Liquidity Requirement
$60.0 million
$218.8 million
Schedule of Maturities of Long-term Debt [Table Text Block]
Scheduled payments due on long-term debt during each of the five years subsequent to December 31, 2011, are as follows:
(Dollars in thousands)
 
 
 
2012
$
21,661

2013
8,413

2014
21,000

2015
22,500

2016
5,000