Goodwill and Other Intangibles - Changes in the carrying amount of goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Balance at beginning of year	$ 193,722	$ 201,535
Translation adjustments	(13,930)	(7,813)
Balance at end of year	$ 179,792	$ 193,722