Goodwill and Intangible Assets - Goodwill (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill, Beginning Balance			$ 151,000,000
Goodwill, Adjustments to prior year acquisitions			700,000
Goodwill, Currency translations			(2,300,000)
Goodwill, Ending Balance	$ 149,400,000		149,400,000
Goodwill Reclassification					$ 9,700,000
Goodwill, Impairment Loss	0	$ 0	0	$ 0
Impairment of Intangible Assets, Finite-lived	0	$ 0	0	$ 0
IT Services and Hardware [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance			148,800,000
Goodwill, Adjustments to prior year acquisitions			700,000
Goodwill, Currency translations			(2,300,000)
Goodwill, Ending Balance	147,200,000		147,200,000
Entertainment and Communications [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance			2,200,000
Goodwill, Adjustments to prior year acquisitions			0
Goodwill, Currency translations			0
Goodwill, Ending Balance	$ 2,200,000		$ 2,200,000