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
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Movement in Deferred Revenue [Roll Forward]        
Balance at beginning of period $ 37,084 $ 28,477 $ 31,047 $ 24,243
Revenues deferred during the period 12,381 8,861 32,531 25,773
Revenues recognized during the period (7,333) (7,837) (21,446) (20,515)
Balance at end of period $ 42,132 $ 29,501 $ 42,132 $ 29,501