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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Movement in Deferred Revenue [Roll Forward]        
Balance at beginning of period $ 28,477 $ 15,620 $ 24,243 $ 8,953
Revenues deferred during the period 8,861 9,362 25,773 27,571
Revenues recognized during the period (7,837) (4,713) (20,515) (16,255)
Balance at end of period $ 29,501 $ 20,269 $ 29,501 $ 20,269