CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
Proportionate share of other companies foreign currency translation adjustment, tax		$ 678	$ 8
Net unrealized appreciation (depreciation) on marketable securities, tax	$ (18)	$ (437)	$ 43
Cash dividends declared (in dollars per share)	$ 0.16	$ 0.16	$ 0.16