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Disclosure of Fair Value of Financial Instruments Disclosure of Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2013
Disclosure of Fair Value of Financial Instruments [Abstract]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
 
 
Carrying Value
 
Fair Value
 
Fair Value Above (Below) Carrying Value
Long-term debt at December 31, 2012 (1)
 
$
2,561,606

 
$
2,841,917

 
$
280,311

 
 
 
 
 
 
 
Payoffs and amortization of long-term debt (1)
 
(2,115
)
 
(2,115
)
 
 
New long-term debt (1)
 
6,738

 
6,738

 
 
Changes in fair value assumptions (1)
 
 
 
(154,305
)
 
(154,305
)
 
 
 
 
 
 
 
Long-term debt at June 30, 2013 (1)
 
$
2,566,229

 
$
2,692,235

 
$
126,006


(1) Does not include the Company's credit facility.