Company-Sponsored Employee Benefit Plans (Estimated Future Benefit Payments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Pension Benefits [Member]
Estimated future benefit payment in year one	$ 74,988
Estimated future benefit payment in year two	82,762
Estimated future benefit payment in year three	92,032
Estimated future benefit payment in year four	102,279
Estimated future benefit payment in year five	113,637
Estimated future benefit payment after year five	732,601
Other Postretirement Plans [Member]
Estimated future benefit payment in year one	378
Estimated future benefit payment in year two	523
Estimated future benefit payment in year three	743
Estimated future benefit payment in year four	921
Estimated future benefit payment in year five	1,063
Estimated future benefit payment after year five	$ 6,169