Financial Instruments and Fair Value Measurements - Estimated Fair Value of Liabilities Measured on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - Contingent Consideration Liabilities [Member] - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurement at beginning of period				$ 644
Contingent consideration liability recorded upon acquisition	$ 36,000	$ 21,400	$ 63,442
Change in fair value measurement			2,291	(36)
Changes resulting from foreign currency fluctuations			209
Contingent consideration paid or settled			(582)	$ (608)
Fair value measurement at end of period	$ 65,360		$ 65,360