Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
OPERATING ACTIVITIES:
Net earnings from continuing operations	$ 15,416	$ 17,881
Net loss from discontinued operations	(2)	(390)
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	42,685	41,814
Pension and post-retirement	3,530	2,781
Deferred income taxes	9,111	10,722
Amortization of stock-based compensation	1,275	1,816
Amortization of DHL promissory note	(3,100)	(3,100)
Net gain on derivative instruments	(742)	(662)
Changes in assets and liabilities:
Accounts receivable	4,023	3,793
Inventory and prepaid supplies	1,689	501
Accounts payable	(2,243)	(10,625)
Unearned revenue	(3,079)	6,420
Accrued expenses, salaries, wages, benefits and other liabilities	(2,964)	(718)
Pension and post-retirement liabilities	(15,239)	(5,276)
Other	(2,329)	(343)
NET CASH PROVIDED BY OPERATING ACTIVITIES	48,031	64,614
INVESTING ACTIVITIES:
Capital expenditures	(72,841)	(69,463)
Proceeds from property and equipment	1,310	2,482
NET CASH (USED IN) INVESTING ACTIVITIES	(71,531)	(66,981)
FINANCING ACTIVITIES:
Principal payments on long term obligations	(32,625)	(5,609)
Proceeds from bank borrowings	60,000	25,000
Reimbursement of hangar construction costs	1,615	0
NET CASH PROVIDED BY FINANCING ACTIVITIES	28,990	19,391
NET INCREASE IN CASH AND CASH EQUIVALENTS	5,490	17,024
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	15,442	30,503
CASH AND CASH EQUIVALENTS AT END OF PERIOD	20,932	47,527
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid, net of amount capitalized	6,417	6,257
Federal alternative minimum and state income taxes paid	666	271
SUPPLEMENTAL NON-CASH INFORMATION:
Debt extinguished	3,100	3,100
Accrued capital expenditures	$ 9,947	$ 10,351