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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Disclosures [Abstract] 
Fair Value, by Balance Sheet Grouping [Table Text Block]
The following table presents the carrying amount and estimated fair values of financial instruments held by the Company at September 30, 2011 and December 31, 2010, using market information and what the Company believes to be appropriate valuation methodologies under generally accepted accounting principles:
 
 
September 30, 2011
 
December 31, 2010
Asset (liability)
 
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
Cash and cash equivalents
$
362,285

 
$
362,285

 
$
349,463

 
$
349,463

Short-term debt
 
(116,167
)
 
(117,074
)
 
(93,057
)
 
(98,042
)
Long-term debt
 
(658,464
)
 
(692,754
)
 
(675,103
)
 
(783,080
)
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
Assets measured at fair value on a recurring basis are summarized below:
 
Asset
 
Carrying Value at
September 30, 2011
 
Level 2
 
Carrying Value at
December 31, 2010
 
Level 2
Investment in special-purpose entity
 
$
2,879

 
$
2,879

 
$
2,879

 
$
2,879