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Revenue Recognition - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
revenue_streams
Sep. 30, 2017
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Decrease in revenue $ (421,319) $ (409,517) $ (1,239,159) $ (1,216,994)    
Allowance for doubtful accounts receivable, write-offs 1,804          
Contract asset 4,512   4,512     $ 0
NET Services accrued contract payments 10,713   10,713     17,487
Deferred revenue 17,419   17,419   $ 20,493 17,381
Contract with customer, revenue recognized     11,602      
Costs to fulfill a contract 1,937   1,937     2,543
Amortization of capitalized contract costs 2,438   2,562      
Service expense            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Decrease in service expense (391,608) $ (378,032) (1,147,914) $ (1,124,478)    
NET Services            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Decrease in revenue (343,771)   (1,024,203)      
Performance obligation satisfied in previous period 1,956   5,685      
WD Services            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Decrease in revenue (77,548)   (214,956)      
Performance obligation satisfied in previous period 3,283   $ 8,357      
Number of revenue streams | revenue_streams     4      
Revenues, reduction penalty     $ 1,681      
Accounting Standards Update 2014-09 | Adjustments due to ASU 2014-09            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Deferred revenue           $ 3,112
Accounting Standards Update 2014-09 | Adjustments due to ASU 2014-09 | NET Services            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Decrease in revenue (3,765)   (11,166)      
Accounting Standards Update 2014-09 | Adjustments due to ASU 2014-09 | NET Services | Service expense            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Decrease in service expense $ 3,765   $ 11,166