Fair Value Measurements - Fair Value Inputs, Liabilities, Quantitative Information (Details) (Contingent Consideration, USD $) In Thousands, unless otherwise specified				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Income Approach Valuation Technique Fair Value, Inputs, Level 3	Dec. 31, 2012 Income Approach Valuation Technique Fair Value, Inputs, Level 3	Dec. 31, 2013 Minimum Income Approach Valuation Technique Fair Value, Inputs, Level 3	Dec. 31, 2012 Minimum Income Approach Valuation Technique Fair Value, Inputs, Level 3	Dec. 31, 2013 Maximum Income Approach Valuation Technique Fair Value, Inputs, Level 3	Dec. 31, 2012 Maximum Income Approach Valuation Technique Fair Value, Inputs, Level 3	Dec. 31, 2013 Revenue-based Payments	Dec. 31, 2012 Revenue-based Payments	Dec. 31, 2013 Other Payments	Dec. 31, 2012 Other Payments
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate				5.40%		11.00%	10.00%	15.00%	14.50%
Contingent consideration liability	$ 2,526	$ 6,697	$ 1,290							$ 2,282	$ 6,370	$ 244	$ 327
Probability of milestone payment				90.00%	90.00%