Commitments and Contingencies (Details)			12 Months Ended
	Dec. 31, 2014 Revolver USD ($)	Oct. 11, 2013 Revolver USD ($)	Dec. 31, 2014 Standby letters of credit lettersofcredit	Dec. 31, 2014 Standby letters of credit Denominated in US dollars USD ($)	Dec. 31, 2013 Standby letters of credit Denominated in US dollars USD ($)	Dec. 31, 2014 Standby letters of credit Denominated in Euros USD ($)	Dec. 31, 2014 Standby letters of credit Denominated in Euros EUR (€)	Dec. 31, 2013 Standby letters of credit Denominated in Euros USD ($)	Dec. 31, 2013 Standby letters of credit Denominated in Euros EUR (€)
Commitments and Contingencies [Line Items]
Amount of letters of credit that can be issued under the Revolver	$ 50,000,000	$ 50,000,000
Standby letters of credit				10,000,000	10,000,000	1,000,000	1,000,000	21,000,000	15,000,000
Letters of credit issued	$ 0			$ 0	$ 0		€ 0		€ 0
Number of irrevocable standby letters of credit			2