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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Movement in Deferred Revenue [Roll Forward]        
Balance at beginning of period $ 15,620 $ 9,305 $ 8,953 $ 123
Revenues deferred during the period 9,362 8,017 27,571 18,921
Revenues recognized during the period (4,713) (6,198) (16,255) (7,920)
Balance at end of period $ 20,269 $ 11,124 $ 20,269 $ 11,124