Operating Segments and Related Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule Revenues by country based
Revenue	$ 53,109	$ 52,087	$ 51,658	$ 51,649	$ 49,944	$ 51,751	$ 50,704	$ 50,718	$ 208,503	$ 203,117	$ 184,081
Schedule Long-lived assets by country based
Long-Lived Assets	52,440				55,948				52,440	55,948
United States [Member]
Schedule Revenues by country based
Revenue									124,302	107,072	92,574
Schedule Long-lived assets by country based
Long-Lived Assets	42,629				46,083				42,629	46,083
United Kingdom [Member]
Schedule Revenues by country based
Revenue									30,437	36,123	31,422
Schedule Long-lived assets by country based
Long-Lived Assets	8,328				8,792				8,328	8,792
Canada [Member]
Schedule Revenues by country based
Revenue									17,007	20,200	22,141
France [Member]
Schedule Revenues by country based
Revenue									11,330	13,425	12,231
Brazil [Member]
Schedule Revenues by country based
Revenue									5,919	5,718	5,128
Mexico [Member]
Schedule Revenues by country based
Revenue									4,877	4,836	3,950
Australia [Member]
Schedule Revenues by country based
Revenue									2,467	1,299	1,690
Sweden [Member]
Schedule Revenues by country based
Revenue									1,753	2,145	1,460
Spain [Member]
Schedule Revenues by country based
Revenue									1,252	1,901	2,065
Czech Republic [Member]
Schedule Revenues by country based
Revenue									1,110	706	654
New Zealand [Member]
Schedule Revenues by country based
Revenue									984	1,111	738
Ireland [Member]
Schedule Revenues by country based
Revenue									954	776	1,024
Other [Member]
Schedule Revenues by country based
Revenue									6,111	7,805	9,004
Schedule Long-lived assets by country based
Long-Lived Assets	$ 1,483				$ 1,073				$ 1,483	$ 1,073