Fair Value Measurements (Details 3) - Foreign exchange contract	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) derivative	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) derivative	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) derivative
Derivatives, Fair Value [Line Items]
Maximum length of time over which our foreign currency forward contracts mature			1 year
Not Designated as Hedges
Derivatives, Fair Value [Line Items]
Number of derivatives | derivative	0		0		1
Notional amount of foreign currency derivatives					$ 11,000,000
Fair Value, Assets, Not Designated As Hedges					$ 0
Pre-tax net gain (loss) on foreign currency contracts	$ 0	$ 0	$ 0	$ 0
Designated as Hedges
Derivatives, Fair Value [Line Items]
Number of derivatives | derivative					0
Notional amount of foreign currency derivatives	150,000,000	119,000,000	150,000,000	119,000,000
Net unrealized gains to be reclassified into earnings within the next twelve months			6,000,000
Ineffective portion relating to these hedges	$ 0	$ 0	$ 0	$ 0