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Fair Value Measurements (Tables) | 6 Months Ended
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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.

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 6 -Footnote 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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