Debt - Short-Term Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Line of Credit Facility [Line Items]
Short-term borrowings	$ 273,849	$ 104,978
Revolving Credit Facility
Line of Credit Facility [Line Items]
Short-term borrowings	273,849	$ 104,978
Minimum
Line of Credit Facility [Line Items]
Short-term borrowings	105,014		$ 35,981
Maximum
Line of Credit Facility [Line Items]
Short-term borrowings	$ 311,506		$ 184,188