Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

Summary of Company's Property and Equipment

The following table summarizes the Company’s property and equipment at December 31.

	2014			2013
	(Thousands of dollars)
Flight equipment	$	1,053,640		$	959,986
Facility & improvements		61,246			57,723
Operating equipment		24,764			24,594
Data processing equipment		32,374			33,870
Vehicles		8,133			7,867
Medical equipment		7,377			7,079
Other		5,332			4,898
		1,192,866			1,096,017
Less accumulated depreciation and amortization		(315,048	)		(310,545	)
Property and equipment, net	$	877,818		$	785,472