Business Acquisitions (Intangible Assets Acquired) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired intangible assets, Fair Value	$ (3,184)	$ 10,836
Acquired intangible assets, Weighted Average Useful Life (in years)	8 years 8 months 10 days	8 years 10 months 20 days
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired intangible assets, Fair Value	$ 3,929	$ 10,762
Acquired intangible assets, Weighted Average Useful Life (in years)	9 years 8 months 12 days	8 years 11 months 9 days
Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired intangible assets, Fair Value	$ 1,056	$ 74
Acquired intangible assets, Weighted Average Useful Life (in years)	4 years 11 months 16 days	2 years 3 months 15 days
Final Allocation Adjustment [Member] | Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired intangible assets, Fair Value	$ (8,169)	$ 0
Acquired intangible assets, Weighted Average Useful Life (in years)	0 days	0 days