Debt and Credit Agreements (Tables)

12 Months Ended

Dec. 31, 2017

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	$	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)	2017			2016
Total debt
6.51% weighted-average senior notes (1)	$	361,000		$	361,000
9.78% senior notes (2)	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	—			—
Unamortized debt issuance costs	(6,109		)	(7,470		)
	$	1,521,891		$	1,520,530

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(1) Includes $237.0 million of current portion of long-term debt at December 31,2017.

(2) Includes $67.0 million of current portion of long-term debt at December 31,2017.