Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Carrying Amounts and Estimated Fair Values of Other Financial Instruments

The following table summarizes the carrying amounts and estimated fair values of our other financial instruments at December 31:

	2012				2011
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(Dollars in thousands)
Assets:
Cash and cash equivalents	$	465,608	$	465,608	$	397,101	$	397,101
Liabilities:
Bank debt	$	1,171,316	$	1,171,316	$	1,131,022	$	1,131,022
5% Notes		500,000		522,500		—		—
Interest rate swap agreements		13,307		13,307		11,239		11,239
Natural gas swap agreements		279		279		797		797