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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement of Comprehensive Income [Abstract]        
Unrealized gain (loss) on investments, tax $ 0 $ 0 $ 0 $ 0
Pension liability adjustments, tax $ (133) $ (706) $ (304) $ (806)