Other, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Income and Expenses [Abstract]
Foreign exchange gain (loss)	$ (10,720)	$ (15,769)	$ 470
Gain on sale of assets and investments	11,334	(352)	(530)
Impairment of equity securities	(703)	(2,346)	(6,593)
Other	1,964	2,536	1,435
Other, net	$ 1,875	$ (15,931)	$ (5,218)