Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Guarantees (Details)

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Commitments and Contingencies - Guarantees (Details) (USD $)
12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Performance Guarantee
Dec. 31, 2013
Performance Guarantee
Dec. 31, 2013
Payment Guarantee
Guarantor Obligations [Line Items]            
Guarantor Obligations, Total Guarantee and Maximum Amount of Grant Available       $ 23,100,000 $ 23,100,000  
Other income (expense), net 8,953,000 3,023,000 (3,505,000) 11,100,000 8,800,000  
Maximum potential amount payable under guarantee           $ 9,000,000