Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value of Financial Instruments [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

The following tables present our financial assets and liabilities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy. The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value.

			Fair Value Measurements at March 31, 2017
			Quoted Prices in		Significant Other		Significant
			Active Markets for		Observable		Unobservable
			Identical Assets		Inputs		Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Assets:
Short-term investments	$	115,674	$	—	$	115,674	$	—
Foreign currency forward exchange contracts not accounted for using hedge accounting		6				6
Foreign currency forward exchange contracts accounted for using hedge accounting		493		—		493		—
	$	116,173	$	—	$	116,173	$	—
Liabilities:
Interest rate swap	$	743	$	—	$	743	$	—

			Fair Value Measurements at December 31, 2016
			Quoted Prices in		Significant Other		Significant
			Active Markets for		Observable		Unobservable
			Identical Assets		Inputs		Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Assets:
Short-term investments	$	94,202	$	—	$	94,202	$	—
Liabilities:
Foreign currency forward exchange contracts accounted for using hedge accounting	$	181	$	—	$	181	$	—
Foreign currency forward exchange contracts not accounted for using hedge accounting		418		—		418		—
Interest rate swap		908		—		908		—
	$	1,507	$	—	$	1,507	$	—