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Condensed Consolidating Financial Statements (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Equity in (income) loss of subsidiaries $ 0 $ 0
Eliminations    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Equity in (income) loss of subsidiaries $ (68,155) 15,921
Restatement adjustment | Overstatement of equity in earnings of subsidiaries    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Equity in (income) loss of subsidiaries   (44,600)
Restatement adjustment | Eliminations | Overstatement of equity in earnings of subsidiaries    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Equity in (income) loss of subsidiaries   $ (44,600)