Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment, Gross	$ 1,048,019	$ 1,057,177
Property and equipment, accumulated depreciation	816,331	815,338
Property, Plant and Equipment, Net	$ 231,688	$ 241,839
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 or Stated Value Per Share	$ 0.01	$ 0.01
Common stock, authorized shares	175,000,000	175,000,000
Common stock, issued shares	46,508,000	46,508,000
Treasury Stock, Shares	271,000	611,000