Arrangements with Off-Balance Sheet Risk - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding surety bonds	$ 45,500,000
Guarantee obligations	$ 120,000,000.0
Standard warranty period	1 year
Senior Credit Facility [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding commercial letters of credit	$ 44,100,000	$ 44,100,000