Income Taxes Reconciliation of Statutory Federal Tax Rates and Effective Tax Rates (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statutory federal tax (benefit) rate	$ (12,057)	$ (14,309)	$ (4,431)
Statutory federal tax (benefit) rate	35.00%	35.00%	35.00%
State taxes	(347)	(266)	(131)
State taxes	1.00%	0.70%	1.00%
Foreign dividend	1,938	6,754	0
Foreign dividend	(5.60%)	(16.50%)	0.00%
Goodwill impairment expense and (benefit) from acquisitions	0	9,377	(81)
Goodwill impairment expense and (benefit) from acquisitions	0.00%	(22.90%)	0.60%
Valuation allowance	32,784	3,725	(5,524)
Valuation allowance	(95.20%)	(9.10%)	43.60%
Taxes on foreign income that differ from U.S. tax rate	(8,507)	(2,796)	(2,888)
Taxes on foreign income that differ from U.S. tax rate	24.70%	6.80%	22.80%
Tax credits	(252)	(304)	(737)
Tax credits	0.70%	0.70%	5.80%
Non-deductible stock-based compensation expense	1,596	1,812	1,275
Non-deductible stock-based compensation expense	(4.60%)	(4.40%)	(10.10%)
Effective Income Tax Rate Reconciliation, Other Adjustments	(1.20%)	(0.90%)	(1.50%)
Other	396	365	202
Effective tax rate	14,955	2,590	(11,132)	[1]
Effective tax rate	(43.50%)	(6.30%)	87.90%
Earnout Liability Fair Value Adjustment [Member]
Earnout liability fair value adjustment	(596)	(1,768)	0
Effective Income Tax Rate Reconciliation, Other Adjustments	1.70%	4.30%	0.00%
Acquisition-related Costs [Member]
Effective Income Tax Rate Reconciliation, Other Adjustments	0.00%	0.00%	(9.30%)
Transaction costs	$ 0	$ 0	$ 1,183

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