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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Revenue $ 1,116,448 $ 1,059,228
Monitoring and Related Services    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Revenue 1,017,292 997,648
Installation and Other    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Revenue $ 99,156 $ 61,580