Acquisitions (Narrative) (Details) - Challenger [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Feb. 12, 2016
Business Acquisition [Line Items]
Acquisition purchase date	Feb. 12, 2016
Acquisition purchase price		$ 10,843
Acquisition purchase price based on future performance	$ 3,000
Other Long-Term Liabilities [Member]
Business Acquisition [Line Items]
Acquisition purchase price based on future performance	2,000
Accrued Expenses And Other Current Liabilities [Member]
Business Acquisition [Line Items]
Acquisition purchase price based on future performance	$ 1,000