Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Taxes [Abstract]
Income Tax Expense (Benefit)	$ 1,534	$ 2,889	$ 5,296	$ 5,094
Effective tax rate (in hundredths)	32.80%		26.70%
Income tax reconciliation, change in tax laws			(1,300)
Income tax reconciliation, sale of office building			1,500
Minimum [Member]
Income Tax Contingency [Line Items]
Potential future increase/(decrease) to unrecognized tax benefits	(6,000)		(6,000)
Maximum [Member]
Income Tax Contingency [Line Items]
Potential future increase/(decrease) to unrecognized tax benefits	8,000		8,000
Non-US Jurisdiction [Member]
Income Tax Contingency [Line Items]
Number of formal assessments	2
Amount in which the reserve for unrecognized tax benefits changed due to foreign currency translation	125
Increase/(Decrease) in reserve for unrecognized tax benefits	$ 162