Acquisition (Narrative) (Details) - USD ($)	Oct. 01, 2016	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Common stock, shares issued (in shares)		142,025,720	140,592,409
Common stock		$ 142,026,000	$ 140,592,000
Global One [Member]
Business Acquisition [Line Items]
Consideration transferred	$ 30,000,000
Common stock, shares issued (in shares)	821,000
Common stock	$ 26,592,000
Cash paid	$ 3,408,000
Earnout liability		$ 14,000,000
Global One [Member] | Minimum [Member]
Business Acquisition [Line Items]
Potential additional payments based on earnings, period	3 years
Global One [Member] | Maximum [Member]
Business Acquisition [Line Items]
Potential additional payments based on earnings, period	5 years