Guarantees (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Guarantor Obligations [Line Items]
Guarantees ExpirationYear	2020
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 15,500,000
Loss Contingency Accrual	0		$ 1,300,000
Loss Contingency Accrual, Payments	2,900,000	$ 1,000,000
Property Lease Guarantee [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	$ 4,000,000		$ 4,700,000