Debt (Details) - USD ($)	Sep. 30, 2015	May. 28, 2015	May. 27, 2015	Dec. 31, 2014
Line of Credit Facility [Line Items]
Short-term borrowings	$ 18,000,000			$ 18,900,000
Remaining borrowing capacity	$ 12,600,000
Minimum
Line of Credit Facility [Line Items]
Debt interest rate	0.90%
Maximum
Line of Credit Facility [Line Items]
Debt interest rate	2.70%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 100,000,000	$ 170,000,000
Current borrowing capacity (up to)		100,000,000
United States | Domestic Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		80,000,000
Europe | Foreign Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 20,000,000