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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 4 Months Ended 5 Months Ended 12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
Mar. 31, 2017
Net loss   $ (38,726)  
Other comprehensive income (loss):      
Unrealized gains (losses) on available for sale securities, net of tax   256  
Change in supplemental executive retirement plan pension liability, net of tax   (1,582)  
Change in pension plan minimum liability, net of tax   (357)  
Change in other benefit plan minimum liability, net of tax   1,536  
Total comprehensive loss   $ (38,873)  
Predecessor      
Net loss $ (1,646,909)   $ (650,011)
Other comprehensive income (loss):      
Unrealized gains (losses) on available for sale securities, net of tax 163   113
Change in loss on derivative contract, net of tax     1,530
Change in supplemental executive retirement plan pension liability, net of tax (536)   (1,721)
Change in pension plan minimum liability, net of tax (594)   399
Change in other benefit plan minimum liability, net of tax (1,468)   (3,799)
Total comprehensive loss $ (1,649,344)   $ (653,489)