Income Taxes Reconciliation of Statutory Federal Tax Rates and Effective Tax Rates (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statutory federal tax (benefit) rate	$ (8,781)	$ (12,057)	$ (14,309)
Statutory federal tax (benefit) rate	35.00%	35.00%	35.00%
State taxes	(246)	(356)	(266)
State taxes	1.00%	1.00%	0.70%
Foreign dividends and unremitted earnings	(586)	1,938	6,754
Foreign dividends and unremitted earnings	2.30%	(5.60%)	(16.50%)
Goodwill impairment expense and (benefit) from acquisitions	0	0	9,377
Goodwill impairment expense and (benefit) from acquisitions	0.00%	0.00%	(22.90%)
Valuation allowance	7,367	26,662	3,725
Valuation allowance	(29.40%)	(77.40%)	(9.10%)
Taxes on foreign income that differ from U.S. tax rate	2,488	(2,314)	(2,796)
Taxes on foreign income that differ from U.S. tax rate	(9.90%)	6.70%	6.80%
Tax credits	0	(252)	(304)
Tax credits	0.00%	0.70%	0.70%
Non-deductible stock-based compensation expense	1,206	1,596	1,812
Non-deductible stock-based compensation expense	(4.80%)	(4.60%)	(4.40%)
Earnout liability fair value adjustment	(43)	(596)	(1,768)
Effective Income Tax Rate Reconciliation, Earn Out Liability, Percent	0.20%	1.70%	4.30%
Effective Income Tax Rate Reconciliation, Other Adjustments	(4.30%)	(1.00%)	(0.90%)
Other	1,087	334	365
Effective tax rate	$ 2,492	$ 14,955	$ 2,590	[1]
Effective tax rate	(9.90%)	(43.40%)	(6.30%)

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