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, 2014
Mar. 31, 2013
Movement in Deferred Revenue [Roll Forward]    
Balance at beginning of period $ 24,243 $ 8,953
Revenues deferred during the period 8,344 8,932
Revenues recognized during the period (6,118) (5,152)
Balance at end of period $ 26,469 $ 12,733