Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Tables)

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Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of gross carrying amounts, related accumulated amortization, net carrying amounts and the weighted-average amortization periods of intangible assets
    June 30, 2018  
    Gross Carrying
Amount		     Accumulated
Amortization		     Net Carrying
Amount		     Weighted-
Average
Amortization
Period (Years)		  
Customer relationships   $ 120,000     $ (79,311 )   $ 40,689       6.0  
Licenses     3,368       (2,213 )     1,155       5.6  
Total intangible assets subject to amortization   $ 123,368     $ (81,524 )   $ 41,844          

 

    December 31, 2017  
    Gross Carrying
Amount		     Accumulated
Amortization		     Net Carrying
Amount		     Weighted-
Average
Amortization
Period (Years)		  
Customer relationships   $ 120,000     $ (66,866 )   $ 53,134       6.0  
Licenses     3,368       (1,601 )     1,767       5.6  
Non-compete agreements     660       (660 )     —       1.0  
Total intangible assets subject to amortization   $ 124,028     $ (69,127 )   $ 54,901          
Schedule of aggregate amortization expense
    Three Months Ended
June 30,		     Six Months Ended
June 30,		  
    2018     2017     2018     2017  
Amortization expense   $ 6,553     $ 7,750     $ 13,057     $ 15,665  
Schedule of estimated future aggregate amortization expense
Year ended December 31,   Amortization
Expense		  
2019   $ 18,489  
2020     9,906  
2021     75  
2022     75  
2023     75