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(Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Unrealized gain (loss) on investments, tax $ 0 $ 0 $ 1,018
Noncash Titan Europe Plc gain, tax 0 0 9,492
Pension liaiblity adjustments, tax $ 3,035 $ (8,700) $ 207