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 Liability [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2016	Jun. 30, 2016	Jun. 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	$ 21,400	$ 21,439
Change in fair value measurement		339	(36)
Changes resulting from foreign currency fluctuations		32
Contingent consideration paid or settled			$ (608)
Fair value measurement at end of period		$ 21,810