Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Subject to amortization
Gross Carrying Value	$ 22,029	$ 22,029
Accumulated Amortization	14,501	12,001
Net Carrying Value	7,528	10,028
Total intangible assets
Gross Carrying Value	49,329	49,329
Net Carrying Value	34,828	37,328
Goodwill recognized in conjunction with the acquisition	12,104	12,104
Amortization of Intangible Assets	2,500	2,900	$ 2,800
Estimated amortization expense
2016	2,100
2017	1,703
2018	1,307
2019	930
2020	574
Thereafter	914
Net Carrying Value	7,528	10,028
Trade name
Not subject to amortization
Carrying Value - Brand name	27,300	27,300
SystemMetrics Corporation
Total intangible assets
Intangible assets recognized			4,380
Goodwill recognized in conjunction with the acquisition			10,527
Telecommunications | Wavecom Solutions Corporation
Total intangible assets
Goodwill recognized in conjunction with the acquisition			1,600
Data Center Colocation Services | SystemMetrics Corporation
Total intangible assets
Goodwill recognized in conjunction with the acquisition		10,500
Customer relationships
Subject to amortization
Gross Carrying Value	21,709	21,709
Accumulated Amortization	14,238	11,799
Net Carrying Value	7,471	9,910
Estimated amortization expense
Net Carrying Value	7,471	9,910
Customer relationships | SystemMetrics Corporation
Total intangible assets
Intangible assets recognized			$ 4,300
Estimated useful life, intangible assets acquired			13 years
Trade name and other
Subject to amortization
Gross Carrying Value	320	320
Accumulated Amortization	263	202
Net Carrying Value	57	118
Estimated amortization expense
Net Carrying Value	$ 57	$ 118
Other intangibles | SystemMetrics Corporation
Total intangible assets
Intangible assets recognized			$ 100