Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2015	Sep. 30, 2015	Jun. 30, 2015
Changes in the carrying amount of goodwill
Balance at the beginning of the period	$ 58,054		$ 58,091	$ 58,091
Currency translation and other adjustment	(89)			(37)
Balance at the end of the period	57,965			58,054
Impairment of goodwill	0	$ 0
Goodwill	58,054		58,091	$ 58,091	$ 57,965	$ 58,054
Total gross carrying amount					46,746	46,700
Accumulated Amortization					(33,170)	(31,136)
Net Amount, Finite Lived Intangibles					13,576	15,564
Amortization expense	$ 2,000		$ 2,000
Estimated future amortization expense of purchased intangible assets
2016 (remaining 9 months)					5,965
2017					7,568
2018					43
Net Amount, Finite Lived Intangibles					$ 13,576	$ 15,564
Minimum
Changes in the carrying amount of goodwill
Useful Lives	5 years
Maximum
Changes in the carrying amount of goodwill
Useful Lives	6 years