(Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on investments, tax	$ 0	$ 0	$ 0
Noncash Titan Europe Plc gain, tax	0	0	0
Pension liaiblity adjustments, tax	$ 439	$ (8,700)	$ (8,700)