Segment and Geographic Information (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Depreciation and amortization
Total	$ 105,282	$ 91,234	$ 110,735
Solutions [Member]
Depreciation and amortization
Total	98,342	84,958	96,271
Systems [Member]
Depreciation and amortization
Total	4,185	3,229	2,992
Software [Member]
Depreciation and amortization
Total	776	1,116	2,461
Corporate and Other [Member]
Depreciation and amortization
Total	1,979	1,931	2,644
Legacy Land Systems (INOVA) [Member]
Depreciation and amortization
Total	$ 0	$ 0	$ 6,367