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Consolidated Statements of Changes in Stockholders' Equity (Deficit) (unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Consolidated Statements of Changes in Stockholders' Equity (Deficit) (unaudited) [Abstract]        
Unrecognized pension and postretirement cost adjustment, tax $ 1 $ 3 $ 4 $ 85
Unrealized gain (loss) on MSA investments, tax 88 69 351 172
Unrealized loss on other investments, tax   0   1
Unrealized loss on interest rate swaps, tax 70 $ 70 563 $ 92
Purchase of call options, tax 5,091   5,091  
Issuance of Convertible Senior Notes, tax $ 778   $ 778