Debt and Credit Agreements (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Schedule of long-term debt and credit agreements

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

	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	%

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

	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	%

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

	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	%

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	%

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

	December 31,
(In thousands)	2015			2014
Total debt
7.33% weighted-average senior notes	$	20,000		$	20,000
6.51% weighted-average senior notes	425,000			425,000
9.78% senior notes	67,000			67,000
5.58% weighted-average senior notes	175,000			175,000
3.65% weighted-average senior notes	925,000			925,000
Revolving credit facility	413,000			140,000
Current maturities
7.33% weighted-average senior notes	(20,000		)	—
Long-term debt, excluding current maturities	$	2,005,000		$	1,752,000

Schedule of credit facility

Interest rates under the amended revolving credit facility are based onLIBORorABRindications, plus a margin which ranges from50to300basis points, as defined in the agreement.