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REVENUE RECOGNITION - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Contract Assets and Liabilities      
Retail revenue period for billing postpaid customers in advance   1 month  
Contract asset, current $ 2,060 $ 2,060 $ 1,900
Change in contract asset - current   $ 160  
% of change in contract asset - current   8.00%  
Contract asset, noncurrent 710 $ 710 802
Change in contract Asset - noncurrent   $ (92)  
% of change in contract Asset - noncurrent   (11.00%)  
Contract liabilities (15,485) $ (15,485) (13,787)
Change in contract liabilities   $ (1,698)  
% of change in contract liabilities   12.00%  
Net contract liability (12,715) $ (12,715) $ (11,085)
Change in net contract liability   $ (1,630)  
% of change in net contract liability   15.00%  
Revenue recognized related to contract liability   $ 10,300  
Amortization of contract assets 400 1,000  
Revenue recognized in the period related to performance obligations that were satisfied or partially satisfied in previous periods $ 300 $ 300