Other Assets (Tables)

12 Months Ended

Dec. 31, 2012

Other Assets [Abstract]

Schedule of the Company's other assets

	2012		2011
	(Thousands of dollars)
Deposits on future purchases of aircraft	$	12,095	$	17,998
Deferred financing cost		3,929		4,597
Investments (Officers’ Deferred Compensation Plan)		1,698		2,807
Other		2,840		1,669
Total	$	20,562	$	27,071