Goodwill and Other Intangible Assets (Intangible Assets, Net) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 53,370	$ 48,565
Accumulated Amortization	18,963	17,039
Net Carrying Amount	34,407	31,526
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	35,461	31,848
Accumulated Amortization	10,725	9,054
Net Carrying Amount	$ 24,736	$ 22,794
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	1 year	1 year
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years	10 years
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,644	$ 2,909
Accumulated Amortization	2,265	2,476
Net Carrying Amount	$ 379	$ 433
Trade Name [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	1 year 6 months	1 year
Trade Name [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	3 years	3 years
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 15,265	$ 13,808
Accumulated Amortization	5,973	5,509
Net Carrying Amount	$ 9,292	$ 8,299
Developed Technology [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	4 years	4 years
Developed Technology [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	7 years	7 years