Debt and Credit Agreements (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Company's Long-Term Debt and credit agreements Components

The Company's debt and credit agreements consisted of the following:

	December 31,
(In thousands)	2014		2013
Long-Term Debt
7.33% weighted-average fixed rate notes	$	20,000	$	20,000
6.51% weighted-average fixed rate notes	425,000		425,000
9.78% fixed rate notes	67,000		67,000
5.58% weighted-average fixed rate notes	175,000		175,000
3.65% weighted-average fixed rate notes	925,000		—
Revolving credit facility	140,000		460,000
	$	1,752,000	$	1,147,000

7.33% weighted-average fixed rate notes

Debt

Schedule of long-term debt instruments by issued tranche

	Principal		Term	Maturity Date	Coupon
Tranche 1	$	75,000,000	10 years	July 2011	7.26	%
Tranche 2	$	75,000,000	12 years	July 2013	7.36	%
Tranche 3	$	20,000,000	15 years	July 2016	7.46	%

6.51% weighted-average fixed rate notes

Debt

Schedule of long-term debt instruments by issued tranche

	Principal		Term	Maturity Date	Coupon
Tranche 1	$	245,000,000	10 years	July 2018	6.44	%
Tranche 2	$	100,000,000	12 years	July 2020	6.54	%
Tranche 3	$	80,000,000	15 years	July 2023	6.69	%

5.58% Weighted Average Fixed Rate Notes

Debt

Schedule of long-term debt instruments by issued tranche

	Principal		Term	Maturity Date	Coupon
Tranche 1	$	88,000,000	10 years	January 2021	5.42	%
Tranche 2	$	25,000,000	12 years	January 2023	5.59	%
Tranche 3	$	62,000,000	15 years	January 2026	5.80	%

3.65% weighted-average fixed rate notes

Debt

Schedule of long-term debt instruments by issued tranche

The notes have bullet maturities and were issued in three separate tranches as follows:

	Principal		Term	Maturity Date	Coupon
Tranche 1	$	100,000,000	7 years	September 2021	3.24	%
Tranche 2	$	575,000,000	10 years	September 2024	3.67	%
Tranche 3	$	250,000,000	12 years	September 2026	3.77	%

Revolving credit facility

Debt

Schedule of changes in the basis spread on LIBOR and Prime rates for changes in the percentage of total indebtedness to the borrowing base

	Debt Percentage
	<25%		25% <50%		50% <75%		75% <90%		90%
Eurodollar loans	1.50	%	1.75	%	2.00	%	2.25	%	2.50	%
ABR loans	0.50	%	0.75	%	1.00	%	1.25	%	1.50	%