Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND ACCOUNTING POLICY BASIS OF PRESENTATION AND ACCOUNTING POLICY (Tables)

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BASIS OF PRESENTATION AND ACCOUNTING POLICY BASIS OF PRESENTATION AND ACCOUNTING POLICY (Tables)
 6 Months Ended
Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Deferred revenues and related activity
revenues and related activity during the three and six months ended June 30, 2015 and 2014, were as follows (in thousands): 
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2015
 
2014
 
2015
 
2014
Balance at beginning of period
$
32,666

 
$
26,469

 
$
31,047

 
$
24,243

Revenues deferred during the period
12,321

 
8,568

 
20,150

 
16,912

Revenues recognized during the period
(7,903
)
 
(6,560
)
 
(14,113
)
 
(12,678
)
Balance at end of period
$
37,084

 
$
28,477

 
$
37,084

 
$
28,477