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Debt, Financing Arrangements and Leases (Tables)

12 Months Ended

Dec. 31, 2012

Debt, Financing Arrangements, and Leases [Abstract]

		December 31,
		2012		2011

		(Thousands of Dollars)
5.95% senior unsecured notes due 2017		$	184,726	$	184,662
6.05% senior unsecured notes due 2018			249,639		249,573
7% senior unsecured notes due 2016			174,809		174,754
7.125% unsecured debentures due 2025			84,853		84,842
	Total long-term debt	$	694,027	$	693,831

ScheduleOfMaturitiesOfLongTermDebtTableTextBlock

		(Thousands
		of Dollars)

2016:	7% senior unsecured notes	$	175,000
2017:	5.95% senior unsecured notes		185,000
Total		$	360,000

OperatingLeasesOfLesseeDisclosureTextBlock

		(Thousands
		of Dollars)
2013		$	2,415
2014			2,415
2015			2,441
2016			2,467
2017			2,494
	Total	$	12,232

- 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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