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Condensed Consolidating Financial Statements (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Provision for income taxes $ 18,033   $ 17,428 $ 14,651 $ 31,425
Equity in (income) loss of subsidiaries 0   0 0 0
Eliminations          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Provision for income taxes 0   0 0 0
Equity in (income) loss of subsidiaries $ (62,649)   $ (54,572) $ (46,728) $ (98,283)
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)