XML 85 R94.htm IDEA: XBRL DOCUMENT v2.4.0.6
Leases (Future Minimum Lease And Mineral And Other Royalty Commitments For All Noncancelable Agreements) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Leases [Abstract]  
2012 $ 70,059
2013 53,271
2014 49,502
2015 45,412
2016 34,196
Thereafter 104,156
Total $ 356,596