Quarterly Results (Unaudited) (Details) (USD $) In Thousands, except Per Share data, 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
Quarterly financial data
Revenue	$ 46,507	$ 53,403	$ 50,205	$ 45,101	$ 53,109	$ 52,087	$ 51,658	$ 51,649	$ 195,216	$ 208,503	$ 203,117
Operating expenses:
Cost of revenue	29,741	30,876	31,521	30,407	34,399	32,461	33,312	34,218	122,545	134,390	137,482
Selling, general and administrative expenses	14,472	13,944	12,630	11,711	13,952	13,242	12,696	12,637	52,757	52,527	49,102
Depreciation of property and equipment	2,162	2,034	2,027	2,008	2,276	1,716	1,579	1,513	8,231	7,084	5,401
Amortization of intangible assets	1,185	1,204	1,332	1,276	2,007	1,431	1,459	2,327	4,997	7,224	4,991
Impairment charges	4,207	0	0	0	0	0	0	0	4,207	0	0
Total operating expenses	51,767	48,058	47,510	45,402	52,634	48,850	49,046	50,695	192,737	201,225	196,976
Operating income	(5,260)	5,345	2,695	(301)	475	3,237	2,612	954	2,479	7,278	6,141
Foreign currency transaction (gains) losses on short-term intercompany balances	41	(636)	225	357	(187)	(348)	497	(339)	(13)	(377)	417
Interest expense (income), net	12	75	53	(217)	(582)	515	529	504	(77)	966	1,616
Income before income taxes	(5,313)	5,906	2,417	(441)	1,244	3,070	1,586	789	2,569	6,689	4,108
Income tax expense (benefit)	1,084	1,029	586	56	(289)	505	584	497	2,755	1,297	1,292
Net income (loss)	$ (6,397)	$ 4,877	$ 1,831	$ (497)	$ 1,533	$ 2,565	$ 1,002	$ 292	$ (186)	$ 5,392	$ 2,816
Basic earnings per common share	$ (0.22)	$ 0.17	$ 0.06	$ (0.02)	$ 0.06	$ 0.10	$ 0.04	$ 0.01	$ (0.01)	$ 0.21	$ 0.11
Diluted earnings per common share	$ (0.22)	$ 0.16	$ 0.06	$ (0.02)	$ 0.06	$ 0.10	$ 0.04	$ 0.01	$ (0.01)	$ 0.21	$ 0.11