Goodwill and Intangible Assets - Goodwill (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill, Beginning Balance			$ 151,000,000
Adjustments to prior year acquisitions			700,000
Mergers			7,600,000
Currency translations			(1,300,000)
Goodwill, Ending Balance	$ 158,000,000		158,000,000
Goodwill Reclassification					$ 9,700,000
Goodwill, Impairment Loss	0	$ 0	0	$ 0
IT Services and Hardware [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance			148,800,000
Adjustments to prior year acquisitions			700,000
Mergers			0
Currency translations			(1,300,000)
Goodwill, Ending Balance	148,200,000		148,200,000
Entertainment and Communications [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance			2,200,000
Adjustments to prior year acquisitions			0
Mergers			7,600,000
Currency translations			0
Goodwill, Ending Balance	$ 9,800,000		$ 9,800,000