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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Movement in Deferred Revenue [Roll Forward]        
Balance at beginning of period $ 12,733 $ 2,964 $ 8,953 $ 123
Revenues deferred during the period 9,277 7,949 18,209 10,904
Revenues recognized during the period (6,390) (1,608) (11,542) (1,722)
Balance at end of period $ 15,620 $ 9,305 $ 15,620 $ 9,305