Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2015

Investments, All Other Investments [Abstract]

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 March 31, 2015:

	Carrying Amount		Fair Value
	(Dollars in thousands)
Assets:
Cash and cash equivalents	$	129,078	$	129,078
Liabilities:
Bank debt	$	1,110,807	$	1,110,807
5½% Senior Notes	300,000		315,750
5% Senior Notes	500,000		515,410
Interest rate swap agreements	1,503		1,503
Natural gas swap agreements	710		710