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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
The following table presents the carrying amount, estimated fair values and categorization under the fair value hierarchy of financial instruments held by the Company at June 30, 2013 and December 31, 2012, using market information and what management believes to be appropriate valuation methodologies under generally accepted accounting principles:
 
June 30, 2013
 
December 31, 2012
Asset (liability)
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
 
 
 
Level 1
 
Level 2
 
 
 
Level 1
 
Level 2
Cash and cash equivalents
$
343,581

 
$
343,581

 
$
—

 
$
280,596

 
$
280,596

 
$
—

Restricted cash (a)
2,956

 
2,956

 
—

 
10,559

 
10,559

 
—

Current maturities of long-term debt
(75,463
)
 
—

 
(75,463
)
 
(150,000
)
 
—

 
(150,000
)
Long-term debt
(1,591,834
)
 
—

 
(1,718,249
)
 
(1,120,052
)
 
—

 
(1,250,341
)
Interest rate swaps (b)
(9,286
)
 
—

 
(9,286
)
 
—

 
—

 
—

Foreign currency exchange contracts (b)
(1,065
)
 
—

 
(1,065
)
 
—

 
—

 
—

Foreign currency option contracts (b)
(716
)
 
—

 
(716
)
 
—

 
—

 
—

Fuel contracts (b)
69

 
—

 
69

 
—

 
—

 
—


(a)
Restricted cash is recorded in “Other Assets” and represents the proceeds from LKE sales deposited with a third-party intermediary.
(b)
See Note 9 — Derivative Financial Instruments and Hedging Activities for information regarding the Balance Sheet classification of the Company’s derivative financial instruments.