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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total financial assets and liabilities at fair value $ 4,273 $ 23,319 $ 56,112
Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total financial assets and liabilities at fair value 4,161 2,683 3,171
Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total financial assets and liabilities at fair value 112 20,636 52,941
Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total financial assets and liabilities at fair value 0 0 0
Gross assets included in investments & other assets [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available-for-sale investment 4,161 2,683 3,171
Gross assets included in investments & other assets [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available-for-sale investment 4,161 2,683 3,171
Gross assets included in investments & other assets [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available-for-sale investment 0 0 0
Gross assets included in investments & other assets [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available-for-sale investment 0 0 0
Currency hedge portfolio [Member] | Gross assets included in other current assets [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 2,091 [1] 5,232 [1] 1,278 [1]
Currency hedge portfolio [Member] | Gross assets included in other current assets [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 0 [1] 0 [1] 0 [1]
Currency hedge portfolio [Member] | Gross assets included in other current assets [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 2,091 [1] 5,232 [1] 1,278 [1]
Currency hedge portfolio [Member] | Gross assets included in other current assets [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 0 [1] 0 [1] 0 [1]
Currency hedge portfolio [Member] | Gross liabilities included in other current assets [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability (2,871) [1]   (1,072) [1]
Currency hedge portfolio [Member] | Gross liabilities included in other current assets [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability 0 [1]   0 [1]
Currency hedge portfolio [Member] | Gross liabilities included in other current assets [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability (2,871) [1]   (1,072) [1]
Currency hedge portfolio [Member] | Gross liabilities included in other current assets [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability 0 [1]   0 [1]
Currency hedge portfolio [Member] | Gross assets included in investments & other assets [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 200 [1]    
Currency hedge portfolio [Member] | Gross assets included in investments & other assets [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 0 [1]    
Currency hedge portfolio [Member] | Gross assets included in investments & other assets [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 200 [1]    
Currency hedge portfolio [Member] | Gross assets included in investments & other assets [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 0 [1]    
Currency hedge portfolio [Member] | Gross liabilities included in Investments & other assets [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability (265) [1]    
Currency hedge portfolio [Member] | Gross liabilities included in Investments & other assets [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability 0 [1]    
Currency hedge portfolio [Member] | Gross liabilities included in Investments & other assets [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability (265) [1]    
Currency hedge portfolio [Member] | Gross liabilities included in Investments & other assets [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability 0 [1]    
Currency hedge portfolio [Member] | Gross assets included in accrued liabilities [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 2,622 [1]   1,077 [1]
Currency hedge portfolio [Member] | Gross assets included in accrued liabilities [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 0 [1]   0 [1]
Currency hedge portfolio [Member] | Gross assets included in accrued liabilities [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 2,622 [1]   1,077 [1]
Currency hedge portfolio [Member] | Gross assets included in accrued liabilities [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 0 [1]   0 [1]
Currency hedge portfolio [Member] | Gross liabilities included in accrued liabilities [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability (3,328) [1]   (896) [1]
Currency hedge portfolio [Member] | Gross liabilities included in accrued liabilities [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability 0 [1]   0 [1]
Currency hedge portfolio [Member] | Gross liabilities included in accrued liabilities [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability (3,328) [1]   (896) [1]
Currency hedge portfolio [Member] | Gross liabilities included in accrued liabilities [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability 0 [1]   0 [1]
Currency hedge portfolio [Member] | Gross assets included in other liabilities [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 4,000 [1]    
Currency hedge portfolio [Member] | Gross assets included in other liabilities [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 0 [1]    
Currency hedge portfolio [Member] | Gross assets included in other liabilities [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 4,000 [1]    
Currency hedge portfolio [Member] | Gross assets included in other liabilities [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 0 [1]    
Currency hedge portfolio [Member] | Gross liabilties included in other liabilities [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability (4,976) [1]    
Currency hedge portfolio [Member] | Gross liabilties included in other liabilities [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability 0 [1]    
Currency hedge portfolio [Member] | Gross liabilties included in other liabilities [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability (4,976) [1]    
Currency hedge portfolio [Member] | Gross liabilties included in other liabilities [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability 0 [1]    
30 day euro forward contract [Member] | Gross assets included in other current assets [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset   650 [1]  
Derivative asset, fair value, gross liability (537) [1]   (1,188) [1]
30 day euro forward contract [Member] | Gross assets included in other current assets [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset   0 [1]  
Derivative asset, fair value, gross liability 0 [1]   0 [1]
30 day euro forward contract [Member] | Gross assets included in other current assets [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset   650 [1]  
Derivative asset, fair value, gross liability (537) [1]   (1,188) [1]
30 day euro forward contract [Member] | Gross assets included in other current assets [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset   0 [1]  
Derivative asset, fair value, gross liability 0 [1]   0 [1]
30 day euro forward contract [Member] | Gross liabilities included in accrued liabilities [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability (1,146) [1]   (248) [1]
30 day euro forward contract [Member] | Gross liabilities included in accrued liabilities [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability 0 [1]   0 [1]
30 day euro forward contract [Member] | Gross liabilities included in accrued liabilities [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability (1,146) [1]   (248) [1]
30 day euro forward contract [Member] | Gross liabilities included in accrued liabilities [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability 0 [1]   0 [1]
Bunker fuel forward contracts [Member] | Gross assets included in other current assets [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 6,825 [1] 17,490 [1] 32,376 [1]
Bunker fuel forward contracts [Member] | Gross assets included in other current assets [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 0 [1] 0 [1] 0 [1]
Bunker fuel forward contracts [Member] | Gross assets included in other current assets [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 6,825 [1] 17,490 [1] 32,376 [1]
Bunker fuel forward contracts [Member] | Gross assets included in other current assets [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 0 [1] 0 [1] 0 [1]
Bunker fuel forward contracts [Member] | Gross liabilities included in other current assets [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability   (5,460) [1]  
Bunker fuel forward contracts [Member] | Gross liabilities included in other current assets [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability   0 [1]  
Bunker fuel forward contracts [Member] | Gross liabilities included in other current assets [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability   (5,460) [1]  
Bunker fuel forward contracts [Member] | Gross liabilities included in other current assets [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability   0 [1]  
Bunker fuel forward contracts [Member] | Gross assets included in investments & other assets [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 852 [1] 7,232 [1] 21,614 [1]
Bunker fuel forward contracts [Member] | Gross assets included in investments & other assets [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 0 [1] 0 [1] 0 [1]
Bunker fuel forward contracts [Member] | Gross assets included in investments & other assets [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 852 [1] 7,232 [1] 21,614 [1]
Bunker fuel forward contracts [Member] | Gross assets included in investments & other assets [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross asset 0 [1] 0 [1] 0 [1]
Bunker fuel forward contracts [Member] | Gross liabilities included in Investments & other assets [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability (713) [1] (3,990) [1]  
Bunker fuel forward contracts [Member] | Gross liabilities included in Investments & other assets [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability 0 [1] 0 [1]  
Bunker fuel forward contracts [Member] | Gross liabilities included in Investments & other assets [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability (713) [1] (3,990) [1]  
Bunker fuel forward contracts [Member] | Gross liabilities included in Investments & other assets [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative asset, fair value, gross liability 0 [1] 0 [1]  
Bunker fuel forward contracts [Member] | Gross liabilities included in accrued liabilities [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 880 [1]    
Bunker fuel forward contracts [Member] | Gross liabilities included in accrued liabilities [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 0 [1]    
Bunker fuel forward contracts [Member] | Gross liabilities included in accrued liabilities [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 880 [1]    
Bunker fuel forward contracts [Member] | Gross liabilities included in accrued liabilities [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 0 [1]    
Bunker fuel forward contracts [Member] | Gross assets included in other liabilities [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 654 [1] 577 [1]  
Bunker fuel forward contracts [Member] | Gross assets included in other liabilities [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 0 [1] 0 [1]  
Bunker fuel forward contracts [Member] | Gross assets included in other liabilities [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 654 [1] 577 [1]  
Bunker fuel forward contracts [Member] | Gross assets included in other liabilities [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross asset 0 [1] 0 [1]  
Bunker fuel forward contracts [Member] | Gross liabilties included in other liabilities [Member] | Estimate of fair value, fair value disclosure [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability (4,176) [1] (1,095) [1]  
Bunker fuel forward contracts [Member] | Gross liabilties included in other liabilities [Member] | Level 1
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability 0 [1] 0 [1]  
Bunker fuel forward contracts [Member] | Gross liabilties included in other liabilities [Member] | Level 2
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability (4,176) [1] (1,095) [1]  
Bunker fuel forward contracts [Member] | Gross liabilties included in other liabilities [Member] | Level 3
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative liability, fair value, gross liability $ 0 [1] $ 0 [1]  
[1] Currency hedge portfolio and bunker fuel forward contracts are designated as hedging instruments. 30-day euro forward contracts are not designated as hedging instruments. To the extent derivatives in an asset position and derivatives in a liability position are with the same counterparty, they are netted in the Condensed Consolidated Balance Sheets because the company enters into master netting arrangements with each of its hedging partners. See also Note 6