Standby Letters of Credit (Tables)

6 Months Ended

Jun. 30, 2011

Standby Letters of Credit [Abstract]

Standby Letters of Credit

	June 30
in thousands	2011
Standby Letters of Credit
Risk management requirement for insurance claims		$41,083
Payment surety required by utilities		133
Contractual reclamation/restoration requirements		8,468
Financial requirement for industrial revenue bond		14,230
Total		$63,914