Acquisition of Working Interests in Natural Gas Properties (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed at Acquisition Date

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date (in thousands):

Accounts receivable	$	1,107
Property, plant and equipment		49,317
Total assets acquired		50,424
Accounts payable		126
Noncurrent accrued and other liabilities		79
Total liabilities assumed		205
Net assets acquired	$	50,219

Summary of Unaudited Pro forma Information During Period of Acquisition

The following table summarizes unaudited pro forma information for the periods presented as if the acquisition of the Working Interests occurred on January 1, 2011. These amounts have been calculated after applying our accounting policies and adjusting the results of the Working Interests to reflect the acquisition-related costs in 2011, and after including the impact of adjustments for additional DD&A assuming the acquisition price paid at October 31, 2012 would have been paid at January 1, 2011 and, in each case, the related income tax effects using the respective effective rate in 2012 and 2011.

	2012		2011
	(In Thousands, Except Per Share Amounts)
Net sales—as reported	$	759,031	$	805,256
Net sales—pro forma	$	764,362	$	808,710
Income from continuing operations—as reported	$	58,786	$	83,984
Income from continuing operations—pro forma	$	60,750	$	84,956
Basic income per common share—as reported	$	2.61	$	3.80
Basic income per common share—pro forma	$	2.70	$	3.85
Diluted income per common share—as reported	$	2.49	$	3.58
Diluted income per common share—pro forma	$	2.57	$	3.62