Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Summary of changes in goodwill
Balance at beginning of period	$ 31,785
Goodwill from Xtrakter acquisition	26,175
Intangible assets with indefinite lives from Xtrakter acquisition	2,120
Balance at end of period	$ 60,080