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Fair Value Measurements Fair Values Measured on Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Restricted cash | $ 2,956 |  | $ 10,559 |
Long-term Debt | 1,591,834 |  | 1,120,052 |
Current maturities of long-term debt | 75,463 |  | 150,000 |
Carrying Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 343,581 |  | 280,596 |
Restricted cash | 2,956 | [1] | 10,559 | [1]
Long-term Debt | 1,591,834 |  | 1,120,052 |
Current maturities of long-term debt | 75,463 |  | 150,000 |
Carrying Value | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swaps | (9,286) | [2] | 0 | [2]
Carrying Value | Fair Value, Measurements, Recurring [Member] | Energy Related Derivative [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fuel contracts | 69 | [2] | 0 | [2]
Carrying Value | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Foreign currency contracts | (1,065) | [2] | 0 | [2]
Carrying Value | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Option [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Foreign currency contracts | (716) | [2] | 0 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 343,581 |  | 280,596 |
Restricted cash | 2,956 | [1] | 10,559 | [1]
Long-term Debt | 0 |  | 0 |
Current maturities of long-term debt | 0 |  | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swaps | 0 | [2] | 0 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 | Fair Value, Measurements, Recurring [Member] | Energy Related Derivative [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fuel contracts | 0 | [2] | 0 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Foreign currency contracts | 0 | [2] | 0 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Option [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Foreign currency contracts | 0 | [2] | 0 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 0 |  | 0 |
Restricted cash | 0 | [1] | 0 | [1]
Long-term Debt | 1,718,249 |  | 1,250,341 |
Current maturities of long-term debt | 75,463 |  | 150,000 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swaps | (9,286) | [2] | 0 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 | Fair Value, Measurements, Recurring [Member] | Energy Related Derivative [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fuel contracts | 69 | [2] | 0 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Foreign currency contracts | (1,065) | [2] | 0 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Option [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Foreign currency contracts | $ (716) |  | $ 0 | [2]
[1] | Restricted cash is recorded in “Other Assets” and represents the proceeds from LKE sales deposited with a third-party intermediary.
[2] | 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 This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date. + References No definition available. + Details
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