SUMMARY OF DEFERRED REVENUE AND OTHER CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred revenue and other current liabilities
Deferred revenue	$ 45,018	$ 47,823
Accrued compensation and related benefits	31,091	24,958
Accrued real estate taxes, utilities and other occupancy	3,352	3,028
Accrued sales tax	3,659	4,628
Accrued interest	2,210	374
Accrued income taxes	1,181	564
Dividends payable	222	152
Other current liabilities	34,329	25,012
Total deferred revenue and other current liabilities	$ 121,062	$ 106,539