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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Movement in Deferred Revenue [Roll Forward]    
Balance at beginning of period $ 32,666 $ 31,047
Revenues deferred during the period 12,321 20,150
Revenues recognized during the period (7,903) (14,113)
Balance at end of period $ 37,084 $ 37,084