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Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement of Comprehensive Income [Abstract]    
Change in estimated fair value of investment in debt securities, tax $ 0 $ 74
Unrecognized actuarial loss and prior service costs, tax 7 (10)
Foreign currency translation adjustments, tax 0 0
Income tax on cash flow hedge activity $ 0 $ (35)