Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other current assets [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Assets, fair value	$ 264	$ 363
Other noncurrent assets [Member] | Investments [Member]
Fair value of financial assets and liabilities
Assets, fair value	3,358	3,090
Other noncurrent assets [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Assets, fair value	0	169
Other current liabilities [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Liabilities, fair value	223	174
Other noncurrent liabilities [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Liabilities, fair value	0	116
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Other current assets [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Other noncurrent assets [Member] | Investments [Member]
Fair value of financial assets and liabilities
Assets, fair value	3,358	3,090
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Other noncurrent assets [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Other current liabilities [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Liabilities, fair value	0	0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Other noncurrent liabilities [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Liabilities, fair value	0	0
Significant Other Observable Inputs (Level 2) [Member] | Other current assets [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Assets, fair value	264	363
Significant Other Observable Inputs (Level 2) [Member] | Other noncurrent assets [Member] | Investments [Member]
Fair value of financial assets and liabilities
Assets, fair value	0	0
Significant Other Observable Inputs (Level 2) [Member] | Other noncurrent assets [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Assets, fair value	0	169
Significant Other Observable Inputs (Level 2) [Member] | Other current liabilities [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Liabilities, fair value	223	174
Significant Other Observable Inputs (Level 2) [Member] | Other noncurrent liabilities [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Liabilities, fair value	0	116
Significant Unobservable Inputs (Level 3) [Member] | Other current assets [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Other noncurrent assets [Member] | Investments [Member]
Fair value of financial assets and liabilities
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Other noncurrent assets [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Other current liabilities [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Liabilities, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Other noncurrent liabilities [Member] | Foreign currency exchange contracts [Member]
Fair value of financial assets and liabilities
Liabilities, fair value	$ 0	$ 0