Goodwill (Schedule Of Goodwill) (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) segment	Dec. 31, 2014 USD ($)
Goodwill [Abstract]
Balance at beginning of period	$ 144,325
Acquisitions	26,797
Foreign currency translation impact	(1,352)
Balance at end of period	$ 169,770	$ 144,325
Number of operating segments | segment	1
Goodwill impairment	$ 0	$ 0