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Segment Reporting (Tables)
12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Information by Reportable Segment The following table shows information by reportable segment for the periods presented (in thousands):
Year Ended
December 31,December 31,December 31,
202020192018
Revenues
GMS$2,080,474 $2,099,737 $1,968,843 
NSS634,154 664,156 639,719 
Corporate— — — 
Total revenues$2,714,628 $2,763,893 $2,608,562 
Operating income (loss)
GMS$80,090 $92,386 $89,141 
NSS22,073 (36,940)(12,556)
Corporate(11,397)(28,627)(26,464)
Total operating income$90,766 $26,819 $50,121 
Amortization of intangible assets
GMS$16,461 $16,679 $18,492 
NSS17,693 16,526 17,288 
Corporate— — — 
Total amortization of intangible assets$34,154 $33,205 $35,780