Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2012

Debt Disclosure [Abstract]

Indebtedness Table

		2012		2011
Bank credit facility (due 2016), interest based on Prime and/or LIBOR plus an applicable
	margin, interest rate at December 31, 2012 and December 31, 2011 was 4.3% and 2.9%, respectively	$	71,000	$	85,000
Senior unsecured notes (due 2018), net of discount of $9.7 million and $11.6 million, respectively,
	which bear interest at the rate of 8.875%		715,305		713,409
Senior unsecured notes (due 2022), which bear interest at the rate of 7.125%			250,000		-
			1,036,305		798,409
	Debt classified as long-term	$	1,036,305	$	798,409

Schedule of Maturities of Long-term Debt [Table Text Block]

2013		-
2014		-
2015		-
2016	$	71,000
2017		-
Thereafter		975,000
Subtotal		1,046,000
Less discount		(9,695)
Total outstanding debt	$	1,036,305

Schedule Of Debt Leverage [Table Text Block]

			Eurodollar Rate
			Loans and		Letter of
	Base Rate		Letter of Credit		Commitment
Leverage Ratio	Loans		Fees		Fees
Greater than or equal to 4.50 to 1.00	2.00	%	3.00	%	0.50	%
Greater than or equal to 4.00 to 1.00 and less than 4.50 to 1.00	1.75	%	2.75	%	0.50	%
Greater than or equal to 3.50 to 1.00 and less than 4.00 to 1.00	1.50	%	2.50	%	0.50	%
Greater than or equal to 3.00 to 1.00 and less than 3.50 to 1.00	1.25	%	2.25	%	0.50	%
Less than 3.00 to 1.00	1.00	%	2.00	%	0.38	%