Contingencies and Contingencies (Details) (Environmental Matters, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Gross liability for environmental matters:
Total recorded liabilities	$ 5,312
Less-expected recoveries of future expenditures, included in other noncurrent assets	(1,501)
Net estimated environmental costs to be funded by future operating cash flows	3,811
Maximum
Commitments and contingencies
Insurance per incident for certain environmental liabilities not known at the time of issuance of policies	10,000
Insurance for certain environmental liabilities not known at the time of issuance of policies	$ 40,000