Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Summary of Rental Expense Incurred under Leases

Rental expense incurred under these leases consisted of the following:


	Year Ended		Year Ended		Year Ended
	December 31,		December 31,		December 31,
	2015		2014		2013
	(Thousands of dollars)
Aircraft	$	45,360	$	44,908	$	41,803
Other		8,358		7,790		7,657

Total	$	53,718	$	52,698	$	49,460

Summary of Remaining Aggregate Lease Commitments Under Operating Leases Having Initial Non-Cancelable Terms in Excess of One Year

The table includes renewal periods on the principal operating facility lease.


	Aircraft		Other		Total
	(Thousands of dollars)
2016	$	44,988	$	5,305	$	50,293
2017		42,699		3,193		45,892
2018		39,018		2,552		41,570
2019		32,365		1,983		34,348
2020		28,526		1,413		29,939
Thereafter		89,604		745		90,349

	$	277,200	$	15,191	$	292,391

- 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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