Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
OPERATING ACTIVITIES:
Net earnings from continuing operations	$ 23,865	$ 39,904	$ 28,202
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(673)	(70)	6,247
Adjustments to reconcile net earnings to net cash provided by operating activities:
Impairment of aircraft	22,065	0	0
Impairment of goodwill and acquired intangibles	5,079	0	0
Depreciation and amortization	91,063	87,594	84,587
Pension and post-retirement	(2,641)	(1,990)	25,268
Deferred income taxes	17,126	20,820	19,743
Amortization of stock-based compensation	2,877	1,720	1,316
Amortization of DHL promissory note	(6,200)	(4,650)	0
Write-off of unamortized debt issuance costs	2,886	0	0
Unrealized loss on derivative instruments	4,881	0	0
Changes in assets and liabilities:
Accounts receivable	1,980	41,529	4,436
Inventory and prepaid supplies	(13)	(6,253)	8,241
Accounts payable	(1,715)	2,729	1,871
Unearned revenue	9,337	6,789	(10,655)
Accrued expenses, salaries, wages, benefits and other liabilities	(8,209)	(44,648)	(36,373)
Pension and post-retirement liabilities	(23,159)	(32,789)	(32,190)
Other	(2,443)	1,578	2,291
NET CASH PROVIDED BY OPERATING ACTIVITIES	136,106	112,263	102,984
INVESTING ACTIVITIES:
Capital expenditures	(213,083)	(110,681)	(101,227)
Proceeds from the disposal of property and equipment	11,147	31,981	8,406
Proceeds from the redemption of interest-bearing investments	1,750	0	0
Proceeds from the redemption of marketable securities	0	0	26
NET CASH (USED IN) INVESTING ACTIVITIES	(200,186)	(78,700)	(92,795)
FINANCING ACTIVITIES:
Principal payments on long-term obligations	(214,424)	(70,249)	(43,074)
Proceeds from borrowings	265,000	0	0
Financing fees	(2,536)	0	0
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	48,040	(70,249)	(43,074)
NET (DECREASE) IN CASH AND CASH EQUIVALENTS	(16,040)	(36,686)	(32,885)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	46,543	83,229	116,114
CASH AND CASH EQUIVALENTS AT END OF PERIOD	30,503	46,543	83,229
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	12,985	16,656	24,093
Federal alternative minimum and state income taxes paid	2,448	523	3,118
SUPPLEMENTAL NON-CASH INFORMATION:
Debt extinguished	6,200	4,650	91,985
Debt extinguished	(6,200)	(4,650)	0
Accrued capital expenditures	$ 10,921	$ 1,404	$ 1,749