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UNEARNED REVENUE (Tables)
6 Months Ended
Jun. 30, 2019
Unearned Revenue  
Changes in unearned revenue

Changes in unearned revenue were as follows:

 

For the period ended  June 30,   December 31   June 30, 
(in thousands)  2019   2018   2018 
Balance at beginning of year  $127,075   $117,614   $117,614 
Deferral of unearned revenue   100,188    166,053    95,948 
Recognition of unearned revenue   (80,496)   (156,592)   (78,290)
Balance at end of period  $146,767   $127,075   $135,272