Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Accounting Policy (Deferred Revenues Included In Other Current Liabilities) (Details)

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Basis of Presentation and Accounting Policy (Deferred Revenues Included In Other Current Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Movement in Deferred Revenue [Roll Forward]    
Balance at beginning of period $ 8,953 $ 123
Revenues deferred during the period 8,932 2,955
Revenues recognized during the period (5,152) (114)
Balance at end of period $ 12,733 $ 2,964