Leases (Tables)

12 Months Ended

Dec. 31, 2011

Leases [Abstract]

Future Minimum Lease And Mineral And Other Royalty Commitments For All Noncancelable Agreements

(add 000)
2012	$	70,059
2013		53,271
2014		49,502
2015		45,412
2016		34,196
Thereafter		104,156
Total	$	356,596