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Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Revenues by service solution          
Revenue $ 138,113 $ 123,772 $ 421,175 $ 382,633  
Capitalized costs         $ 6,200
Contract asset 7,400   $ 7,400    
Capitalized costs amortization period     5 years    
Cost amortization 500   $ 1,400    
Impairment loss 0   $ 0    
Accounting Standards Update 2014-09          
Revenues by service solution          
Capitalized costs         $ 6,200
Capitalized costs amortization period     5 years    
Equipment Solutions          
Revenues by service solution          
Revenue 60,279 54,152 $ 185,713 172,845  
Clinical Engineering          
Revenues by service solution          
Revenue 40,366 33,406 119,415 101,160  
On-Site Managed Services          
Revenues by service solution          
Revenue $ 37,468 $ 36,214 $ 116,047 $ 108,628