Goodwill And Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, Gross			$ 161,219	$ 161,001	$ 161,075
Accumulated impairment losses			(73,111)	(73,111)	(73,111)
Goodwill, Net, Beginning Balance	$ 88,108	$ 87,890	$ 88,108	$ 87,890	$ 87,964
Goodwill acquired during the year	253
Effects of foreign currency exchange	(35)	(74)
Goodwill, Net, Ending Balance	$ 88,108	$ 87,890