Operating Segments and Related Information (by Country) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenue	$ 46,507	$ 53,403	$ 50,205	$ 45,101	$ 53,109	$ 52,087	$ 51,658	$ 51,649	$ 195,216	$ 208,503	$ 203,117
Long-lived assets	41,754				52,440				41,754	52,440
Total revenue [Member]
Segment Reporting Information [Line Items]
Concentration risk (percent)											10.20%
United States [Member]
Segment Reporting Information [Line Items]
Revenue									115,819	124,302	107,072
Long-lived assets	33,686				42,629				33,686	42,629
United Kingdom [Member]
Segment Reporting Information [Line Items]
Revenue									24,639	30,437	36,123
Long-lived assets	6,690				8,328				6,690	8,328
Canada [Member]
Segment Reporting Information [Line Items]
Revenue									19,584	17,007	20,200
France [Member]
Segment Reporting Information [Line Items]
Revenue									10,225	11,330	13,425
Brazil [Member]
Segment Reporting Information [Line Items]
Revenue									5,090	5,919	5,718
Mexico [Member]
Segment Reporting Information [Line Items]
Revenue									4,482	4,877	4,836
Australia [Member]
Segment Reporting Information [Line Items]
Revenue									4,461	2,467	1,299
New Zealand [Member]
Segment Reporting Information [Line Items]
Revenue									976	984	1,111
Thailand [Member]
Segment Reporting Information [Line Items]
Revenue									971	896	470
Czech Republic [Member]
Segment Reporting Information [Line Items]
Revenue									909	1,110	706
Hong Kong [Member]
Segment Reporting Information [Line Items]
Revenue									851	743	586
Spain [Member]
Segment Reporting Information [Line Items]
Revenue									844	1,252	1,901
Other [Member]
Segment Reporting Information [Line Items]
Revenue									6,365	7,179	9,670
Long-lived assets	$ 1,378				$ 1,483				$ 1,378	$ 1,483