Acquisitions Purchase Price (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Jetalon [Member]	Apr. 01, 2013 Jetalon [Member]
Business Acquisition [Line Items]
Cash paid at closing	$ 13,358	$ 2,961	$ 0	$ 13,358
Contingent consideration obligation	1,282	0			3,094
Total purchase price					$ 16,452