Other Current Assets and Other Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Other current assets [Abstract]
Revenue recognized in excess of billings, net of reserves of $1,162 and $1,763, respectively	$ 18,389	$ 18,812
Equity investment	0	2,016
Other non-trade receivables	614	793
Taxes receivable	14	0
Total other current assets	19,017	21,621
Revenue recognized in excess of billings, reserves	1,162	1,763
Other current liabilities [Abstract]
Customer deposits	2,915	3,409
Acquisition obligations	2,602	2,815
Accrued taxes	463	998
Leases line facility	0	897
Leases payable	6	83
Other liabilities	2,584	4,404
Total other current liabilities	$ 8,570	$ 12,606