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Fair Value Disclosure of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2013
Notes To Financial Statements [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis

Assets and Liabilities Measured at Fair Value on a Recurring Basis at June 30, 2013
(dollars in thousands)
 
Quoted Prices in
Active Markets for
Identical Assets
and Liabilities
(Level 1)
 
Significant
Other
Observable
Inputs (Level 2)
 
Significant
Unobservable
Inputs (Level 3)
 
Balance at
 
 
 
 
June 30, 2013
Assets
 

 
 

 
 

 
 

Derivative financial instruments
$
—

 
$
10,688

 
$
—

 
$
10,688

Liabilities
 

 
 

 
 

 
 

Derivative financial instruments
$
—

 
$
11,907

 
$
—

 
$
11,907

Assets and Liabilities Measured at Fair Value on a Recurring Basis at December 31, 2012
(dollars in thousands)
 
Quoted Prices in
Active Markets for
Identical Assets
and Liabilities
(Level 1)
 
Significant
Other
Observable
Inputs (Level 2)
 
Significant
Unobservable
Inputs (Level 3)
 
Balance at
 
 
 
 
December 31, 2012
Assets
 

 
 

 
 

 
 

Derivative financial instruments
$
—

 
$
288

 
$
—

 
$
288

Liabilities
 

 
 

 
 

 
 

Derivative financial instruments
$
—

 
$
21,423

 
$
—

 
$
21,423