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Debt, Financing Arrangements, and Leases (Tables)

12 Months Ended

Dec. 31, 2014

Long-term debt, presented net of unamortized discount, consists of the following:



	December 31,
	2014		2013
	(Thousands of Dollars)
5.95% senior unsecured notes due 2017	$	184,854	$	184,790
6.05% senior unsecured notes due 2018	249,771		249,705
7% senior unsecured notes due 2016	174,919		174,864
7.125% unsecured debentures due 2025	84,876		84,865
Total long-term debt	$	694,420	$	694,224

Maturities of long-term debt

As of December 31, 2014, cumulative maturities of outstanding long-term debt (at face value) for the next five years are as follows:



	(Thousands of Dollars)
2016: 7% senior unsecured notes	$	175,000
2017: 5.95% senior unsecured notes	185,000
2018: 6.05% senior unsecured notes	250,000
Total	$	610,000

Leases [Abstract]

Future minimum annual rental payments

Following are the estimated future minimum annual rental payments required under operating leases, which have initial or remaining noncancelable lease terms in excess of one year:



	(Thousands of Dollars)
2015	$	2,581
2016	2,608
2017	2,634
2018	2,661
2019	2,687
Total	$	13,171

- Definition

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

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