Acquisitions and Divestitures - Openwave (Details) - USD ($) $ in Thousands		3 Months Ended
	Mar. 01, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 224,954		$ 224,651
Openwave Messaging
Business Acquisition [Line Items]
Consideration Transferred	$ 114,538
Total preliminary cash consideration transferred	92,538
Value of common stock paid for acquisition	22,000	0	$ 22,000
Consideration Transferred, Other	10,000
Cash consideration for outstanding common shares	102,538
Intellectual Property Settlement	10,000
Cash	4,110
Prepaid expenses and other assets	3,005
Property, Plant and Equipment	2,882
Long term assets	1,870
Goodwill	81,015
Total assets	154,982
Accounts Payable and Accrued Liabilities	17,622
Deferred Revenue	7,331
Long term Liabilities	15,491
Net assets acquired	114,538
Openwave Messaging | Trade Names
Business Acquisition [Line Items]
Intangible assets	$ 1,000
Intangible assets, weighted average life	1 year
Openwave Messaging | Developed Technology Rights
Business Acquisition [Line Items]
Intangible assets	$ 32,100
Intangible assets, weighted average life	7 years
Openwave Messaging | Customer Relationships
Business Acquisition [Line Items]
Intangible assets	$ 29,000
Intangible assets, weighted average life	10 years
Selling, general and administrative
Business Acquisition [Line Items]
Acquisition Related Costs		$ 11,800	$ 1,300