Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)

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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Statement of Financial Position [Abstract]    
Accrued expenses (1) $ 96,666 $ 125,119
Property, Plant and Equipment, Net [Abstract]    
Property and equipment, accumulated depreciation $ 857,866 $ 866,614
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, authorized shares 10,000,000 10,000,000
Preferred stock, issued shares 0 0
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Common stock, par value (in dollars per share) $ 0.009993755296 $ 0.009992761427
Common stock, authorized shares 175,000,000 175,000,000
Common stock, issued shares 57,435,867 56,641,000