Fair Value Measurements - Fair Value Inputs, Liabilities, Quantitative Information (Details) (Contingent Consideration, USD $) In Thousands, unless otherwise specified							9 Months Ended				9 Months Ended		9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2014 Income Approach Valuation Technique Fair Value, Inputs, Level 3	Sep. 30, 2014 Minimum Income Approach Valuation Technique Fair Value, Inputs, Level 3	Sep. 30, 2014 Maximum Income Approach Valuation Technique Fair Value, Inputs, Level 3	Sep. 30, 2014 Revenue-based Payments	Sep. 30, 2014 Revenue-based Payments Income Approach Valuation Technique Fair Value, Inputs, Level 3	Sep. 30, 2014 Other Payments	Sep. 30, 2014 Other Payments Income Approach Valuation Technique Fair Value, Inputs, Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate							5.00%	1.00%	14.00%
Contingent consideration liability	$ 1,717	$ 2,507	$ 2,526	$ 2,562	$ 6,692	$ 6,697				$ 1,462		$ 255
Probability of milestone payment											90.00%		100.00%