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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 4 Months Ended 5 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jul. 31, 2017
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Net loss $ (11,182)     $ (38,726) $ (50,211)    
Other comprehensive income (loss):              
Unrealized gains (losses) on available for sale securities, net of tax 43     256 (256)    
Change in supplemental executive retirement plan 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 $ (11,139)     $ (38,873) $ (50,467)    
Predecessor              
Net loss   $ (524,410) $ (1,646,909)     $ (611,382) $ (650,011)
Other comprehensive income (loss):              
Unrealized gains (losses) on available for sale securities, net of tax   86 163     (8) 113
Change in loss on derivative contract, net of tax           1,317 1,530
Change in supplemental executive retirement plan liability, net of tax     (536)     (1,721) (1,721)
Change in pension plan minimum liability, net of tax     (594)     399 399
Change in other benefit plan minimum liability, net of tax     (1,468)     (3,799) (3,799)
Total comprehensive loss   $ (524,324) $ (1,649,344)     $ (615,194) $ (653,489)