Goodwill and Intangible Assets (Summary of Intangible Assets) (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 50,764	$ 50,498
Accumulated Amortization	(29,214)		$ (25,879)
Intangibles, net	21,550		24,619
Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	28,050	28,005
Accumulated Amortization	(17,818)		(15,723)
Intangibles, net	$ 10,232		$ 12,282
Weighted Average Amortization Period	4 years 8 months 18 days		4 years 8 months 18 days
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 16,016	16,008
Accumulated Amortization	(7,777)		$ (6,873)
Intangibles, net	$ 8,239		$ 9,135
Weighted Average Amortization Period	5 years 9 months 18 days		5 years 9 months 18 days
Trade names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,298	1,287
Accumulated Amortization	(1,271)		$ (1,250)
Intangibles, net	$ 27		$ 37
Weighted Average Amortization Period	2 years 7 months 12 days		2 years 7 months 12 days
Non-compete agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,448	1,446
Accumulated Amortization	(1,079)		$ (936)
Intangibles, net	$ 369		$ 510
Weighted Average Amortization Period	1 year 8 months 12 days		1 year 8 months 12 days
Patents [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,690	3,440
Accumulated Amortization	(1,034)		$ (848)
Intangibles, net	$ 2,656		$ 2,592
Weighted Average Amortization Period	10 years 4 months 18 days		10 years 4 months 18 days
Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 262	$ 312
Accumulated Amortization	(235)		$ (249)
Intangibles, net	$ 27		$ 63
Weighted Average Amortization Period	3 years		3 years