Business Acquisition (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Telestack Limited [Member]	Sep. 30, 2014 Telestack Limited [Member] Trade names [Member]	Sep. 30, 2014 Telestack Limited [Member] Patents [Member] Minimum [Member]	Sep. 30, 2014 Telestack Limited [Member] Patents [Member] Maximum [Member]	Sep. 30, 2014 Telestack Limited [Member] Noncompete agreements [Member]	Sep. 30, 2014 Telestack Limited [Member] Customer relationships [Member]
Business Acquisition [Line Items]
Date of acquisition			Apr. 01, 2014
Percentages of stock acquired of Telestack Limited (in hundredths)			100.00%
Total purchase price			$ 36,183
Purchase price deposited in escrow			2,500
Goodwill	32,820	15,057	18,258
Other intangibles assets			$ 14,447
Useful life of intangible assets				15 years	5 years	10 years	3 years	11 years