Systems, Equipment and Other Assets Related to Contracts, net (Tables)

12 Months Ended

Dec. 31, 2016

Systems, Equipment and Other Assets Related to Contracts, net

Schedule of Systems, Equipment and Other Assets Related to Contracts, net

	December 31,
($ thousands)	2016		2015
Land	574		590
Buildings	121,572		110,049
Terminals and systems	2,652,742		2,574,369
Furniture and equipment	172,666		177,425
Contracts in progress	169,367		92,356
	3,116,921		2,954,789
Accumulated depreciation	(1,917,247	)	(1,827,271	)
	1,199,674		1,127,518