Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement of Cash Flows [Abstract]
Net income (loss) (1)	$ 35,220	$ 220,439
Operating Activities:
Depreciation and amortization (1)	13,097	12,459
Equity (income) loss from equity method investments	69	(75,417)
Acquisition (gain) loss	0	(135,588)
Non-cash debt and financing costs	229	460
(Gain) loss on early extinguishment of debt	0	486
Stock-based compensation expense	4,060	1,101
Proceeds from Rents Received	3,077	0
(Gain) loss on write down and disposal of long-lived assets	511	19
Pension and other post-retirement benefits	1,274	687
Change in deferred income taxes	951	(147)
Change in operating assets (1)	(24,520)	24,670
Change in operating liabilities (1)	(49,330)	(39,039)
Other (1)	(488)	(88)
Net cash provided by (used in) operating activities (1)	(15,850)	10,042
Investing activities:
Capital expenditures	(16,021)	(7,298)
Acquisitions, net of cash received	0	167,129
Net cash provided by (used in) investing activities	(15,249)	159,831
Financing activities:
Payments of revolving line of credit	0	(33,881)
Proceeds from Issuance of Secured Debt	0	329,659
Payment of long-term debt	(4,313)	(353,000)
Proceeds from exercise of stock options	275	2,063
Proceeds from Equity Method Investment, Distribution	772	0
Net cash provided by (used in) financing activities	(4,038)	(55,159)
Net increase (decrease) in cash and cash equivalents	(35,137)	114,714
Effect of foreign currency fluctuations on cash (1)	(7,061)	1,156
Cash and cash equivalents at beginning of fiscal period	286,846	109,774
Cash and cash equivalents at end of fiscal period	$ 244,648	$ 225,644