Other Non-Operating Income (Expense), Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Non-Operating Income (Expense), Net [Abstract]
Interest and dividend income	$ 151	$ 296	$ 302
Equity income (loss) from joint ventures	976	(822)	(285)
Loss on foreign exchange	(719)	(1,562)	(143)
Write-off of deferred financing costs	(773)	0	0
Other non-operating income, net	145	119	127
Total other non-operating income (expense), net	$ (220)	$ (1,969)	$ 1