Income Taxes Reconciliation of income tax expense and rate based on the U.S. statutory rate to the Companys income tax expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income tax expense based on the U.S. statutory rate	$ 7,227	$ 11,205	$ 7,046
Effect of charge related to the UK OFT matter	0	0	(3,381)
State income taxes, net of federal tax benefit	1,147	1,013	684
Permanent items	179	148	164
Effect of foreign operations	1,008	2	289
Net change in uncertain tax positions	(737)	(274)	(139)
Change in valuation allowance - foreign loss carryforwards	(898)	477	634
HIRE Act income tax credit	(763)	0	(947)
Effective Income Tax Rate Reconciliation, Tax Credits, Other	(3.70%)	0.00%	(4.70%)
Stock-based compensation	241	382	689
Other	296	(371)	91
Income tax expense	$ 7,700	$ 12,582	$ 5,130
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Income tax expense based on the U.S. statutory rate (as a percentage)	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit, as a percentage	5.60%	3.20%	3.40%
Permanent items, as a percentage	0.90%	0.50%	0.80%
Effect of foreign operations, as a percenage	4.90%	0.00%	1.40%
Net change in uncertain tax positions, as a percentage	(3.60%)	(0.90%)	(0.70%)
Change in valuation allowance - federal foreign tax credits, as a percentage	0.00%	0.00%	(16.80%)
Change in valuation allowance - foreign loss carryforwards, as a percentage	(4.30%)	1.50%	3.20%
Stock-based compensation, as a percentage	1.10%	1.20%	3.40%
Other, as a perentage	1.40%	(1.20%)	0.50%
Income tax expense, as a percentage	37.30%	39.30%	25.50%