Divestitures - Narrative (Details) - USD ($) $ in Thousands					12 Months Ended
	Jan. 06, 2016	Aug. 18, 2014	Apr. 16, 2014	Mar. 08, 2012	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of subsidiary					$ 0	$ 54,748
Corvisa LLC (formerly CorvisaCloud LLC) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Severance costs					800
Transaction-related costs					500
Advent Financial Services LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of intangible assets		$ 1,000
Gain on disposition of intangible assets		$ 800
StreetLinks LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earned bonus payments			$ 1,000
Gain on sale of subsidiary, before income tax						48,200
Transaction-related costs						1,800
Purchase and Sale Agreement [Member] | Assurant Services, LLC [Member] | StreetLinks LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash received at closing			60,000
Proceeds from sale of subsidiary			53,900
Proceeds from sale of subsidiary, adjustments for working capital						800
Contingent Consideration Receivable [Member] | Purchase and Sale Agreement [Member] | Assurant Services, LLC [Member] | StreetLinks LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Post-closing consideration, maximum			12,000
2015 [Member] | Minimum [Member] | Contingent Consideration Receivable [Member] | Purchase and Sale Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Post-closing consideration, total revenue requirement			184,000
2016 [Member] | Minimum [Member] | Contingent Consideration Receivable [Member] | Purchase and Sale Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Post-closing consideration, total revenue requirement			167,500
Potential Bonus Payments to StreetLinks Employees [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Potential reduction of proceeds, maximum			$ 2,000
Subsequent Event [Member] | Corvisa LLC (formerly CorvisaCloud LLC) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earned bonus payments	$ 300
Gain on sale of subsidiary, before income tax	800
Transaction-related costs	1,000
Subsequent Event [Member] | Membership Interest Purchase Agreement [Member] | ShoreTel, Inc. [Member] | Corvisa LLC (formerly CorvisaCloud LLC) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total consideration	8,400
Cash received at closing	7,000
Consideration held in escrow - indemnification obligations	1,000
Consideration held in escrow - working capital adjustment obligations	350
Stock Options [Member] | Subsequent Event [Member] | Corvisa LLC (formerly CorvisaCloud LLC) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Share-based compensation expense due to the accelerated vesting of options	$ 100
StreetLinks LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Increase in ownership percentage				5.00%
Ownership percentage			88.00%
Decrease in ownership percentage			3.00%
StreetLinks LLC [Member] | Unit Purchase Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Membership units				1,927
Purchase price				$ 6,100
Units transferred			1,218
Note payable to related party			$ 3,900
Note payable to related party, future interest payments			$ 200
Employee Severance [Member] | Corvisa LLC (formerly CorvisaCloud LLC) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contractual Obligation, due in next twelve months					$ 100
Additional Paid-in Capital [Member] | StreetLinks LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Exchange of membership interests for forgiveness of note payable						3,800
Noncontrolling Interest [Member] | StreetLinks LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Exchange of membership interests for forgiveness of note payable						$ 100