Goodwill and Other Intangibles - Changes in the carrying amount of goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Balance at beginning of year	$ 179,792	$ 193,722
Translation adjustments	2,220	(13,930)
Balance at end of year	$ 182,012	$ 179,792