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Notes Payable Notes Payable (Tables)
12 Months Ended
Dec. 31, 2012
Line of Credit Facility  
Schedule of Short-term Debt
We had the following short-term debt outstanding at the Consolidated Balance Sheet dates (in thousands):
 
Dec. 31, 2012
Dec. 31, 2011
 
Balance Outstanding
Letters of Credit
Balance Outstanding
Letters of Credit
Revolving Credit Facility
$
127,000

$
36,300

$
195,000

$
43,700

Term Loan due June 2013 (a)
150,000


150,000


Total
$
277,000

$
36,300

$
345,000

$
43,700

Deferred Financing Costs [Table Text Block]
Our deferred financing costs and associated amortization expense included in Interest expense on the accompanying Consolidated Statements of Income were as follows (in thousands):
 
Deferred Financing Costs Remaining in Other Assets, Non-current on Balance Sheet at
Amortization Expense for the years ended Dec. 31,
 
Dec. 31, 2012
2012
2011
2010
Senior unsecured notes due 2014
$
634

 
$
462

$
462

$
462

Senior unsecured notes due 2020
$
1,260

 
$
167

$
167

$
77

First mortgage bonds due 2032
$
651

 
$
33

$
33

$
33

First mortgage bonds due 2039
$
2,037

 
$
76

$
76

$
76

First mortgage bonds due 2037
$
766

 
$
31

$
31

$
31

Black Hills Wyoming project financing due 2016
$
3,177

 
$
1,037

$
1,012

$
1,036

Other
$
721

 
$
57

$
70

$
74

Credit Facility Covenants
Certain debt obligations require compliance with the following covenants at the end of each quarter (dollars in thousands):
 
At Dec. 31, 2012
 
Covenant Requirement
Consolidated net worth
$
1,232,509

 
Greater than
$
924,895

Recourse leverage ratio
53.8
%
 
Less than
65.0
%
Revolving Credit Facility, Existing [Member]
 
Line of Credit Facility  
Deferred Financing Costs [Table Text Block]
The deferred financing costs on the new facility are being amortized as follows (in thousands):
 
Deferred Financing Costs Remaining on Balance Sheet as of
Amortization Expense for the years ended Dec. 31,
 
Dec. 31, 2012
2012
2011
2010
Revolving Credit Facility
$
2,068

$
2,187

$
1,891

$
1,340