Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
OPERATING ACTIVITIES:
Net earnings from continuing operations	$ 41,648	$ 23,865	$ 39,904
Net loss from discontinued operations	(774)	(673)	(70)
Adjustments to reconcile net earnings to net cash provided by operating activities:
Impairment of aircraft	0	22,065	0
Impairment of goodwill and acquired intangibles	0	5,079	0
Depreciation and amortization	84,477	91,063	87,594
Pension and post-retirement	5,562	(2,641)	(1,990)
Deferred income taxes	23,749	17,126	20,820
Amortization of stock-based compensation	3,231	2,877	1,720
Amortization of DHL promissory note	(6,200)	(6,200)	(4,650)
Net (gain) loss on derivative instruments	(1,879)	4,881	0
Write-off of unamortized debt issuance costs	0	2,886	0
Changes in assets and liabilities:
Accounts receivable	(4,328)	1,980	41,529
Inventory and prepaid supplies	(1,759)	(13)	(6,253)
Accounts payable	(5,688)	(1,715)	2,729
Unearned revenue	654	9,337	6,789
Accrued expenses, salaries, wages, benefits and other liabilities	4,898	(8,209)	(44,648)
Pension and post-retirement liabilities	(27,926)	(23,159)	(32,789)
Other	(5,032)	(2,443)	1,578
NET CASH PROVIDED BY OPERATING ACTIVITIES	110,633	136,106	112,263
INVESTING ACTIVITIES:
Capital expenditures	(155,243)	(213,083)	(110,681)
Proceeds from property and equipment	5,772	11,147	31,981
Proceeds from the redemption of interest-bearing investments	0	1,750	0
NET CASH (USED IN) INVESTING ACTIVITIES	(149,471)	(200,186)	(78,700)
FINANCING ACTIVITIES:
Principal payments on long term obligations	(26,223)	(214,424)	(70,249)
Proceeds from borrowings	50,000	265,000	0
Financing fees	0	(2,536)	0
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	23,777	48,040	(70,249)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(15,061)	(16,040)	(36,686)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	30,503	46,543	83,229
CASH AND CASH EQUIVALENTS AT END OF PERIOD	15,442	30,503	46,543
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	13,195	12,985	16,656
Federal alternative minimum and state income taxes paid	377	2,448	523
SUPPLEMENTAL NON-CASH INFORMATION:
Debt extinguished	6,200	6,200	4,650
Accrued capital expenditures	$ 4,770	$ 10,921	$ 1,404